AP_Airspeed: Calibration: remove unused DT

[IamPete1]

No description provided.

[IamPete1]

Getting some odd size results.....
Durandal saves through out, but much more than expected:

Binary Name      Text [B]         Data [B]     BSS (B)        Total Flash Change [B] (%)      Flash Free After PR (B)
---------------  ---------------  -----------  -------------  ----------------------------  -------------------------
blimp            -20 (-0.0015%)   0 (0.0000%)  -4 (-0.0015%)  -20 (-0.0015%)                                   592224
ardurover        -120 (-0.0072%)  0 (0.0000%)  0 (0.0000%)    -120 (-0.0072%)                                  290884
ardusub          -112 (-0.0069%)  0 (0.0000%)  0 (0.0000%)    -112 (-0.0069%)                                  345704
arducopter-heli  -120 (-0.0066%)  0 (0.0000%)  0 (0.0000%)    -120 (-0.0066%)                                  136308
arduplane        -84 (-0.0046%)   0 (0.0000%)  -4 (-0.0015%)  -84 (-0.0046%)                                   150236
arducopter       -128 (-0.0070%)  0 (0.0000%)  0 (0.0000%)    -128 (-0.0070%)                                  134204
antennatracker   -40 (-0.0030%)   0 (0.0000%)  0 (0.0000%)    -40 (-0.0030%)                                   614580

MatekF405 generally costs flash:

Binary Name      Text [B]        Data [B]     BSS (B)        Total Flash Change [B] (%)      Flash Free After PR (B)
---------------  --------------  -----------  -------------  ----------------------------  -------------------------
blimp            -4 (-0.0006%)   0 (0.0000%)  4 (+0.0031%)   -4 (-0.0006%)                                    334632
ardurover        100 (+0.0125%)  0 (0.0000%)  -4 (-0.0031%)  100 (+0.0124%)                                   179424
ardusub          92 (+0.0116%)   0 (0.0000%)  4 (+0.0031%)   92 (+0.0116%)                                    189184
arducopter-heli  -16 (-0.0018%)  0 (0.0000%)  0 (0.0000%)    -16 (-0.0018%)                                    87608
arduplane        24 (+0.0026%)   0 (0.0000%)  0 (0.0000%)    24 (+0.0026%)                                     44160
arducopter       -8 (-0.0009%)   0 (0.0000%)  0 (0.0000%)    -8 (-0.0009%)                                     92048
antennatracker   4 (+0.0006%)    0 (0.0000%)  -4 (-0.0031%)  4 (+0.0006%)                                     353416

MambaH743v4 - saves except copter/heli:

Binary Name      Text [B]         Data [B]     BSS (B)        Total Flash Change [B] (%)      Flash Free After PR (B)
---------------  ---------------  -----------  -------------  ----------------------------  -------------------------
blimp            -36 (-0.0031%)   0 (0.0000%)  -4 (-0.0015%)  -36 (-0.0030%)                                   522016
ardurover        -148 (-0.0100%)  0 (0.0000%)  4 (+0.0015%)   -148 (-0.0100%)                                  227292
ardusub          -156 (-0.0110%)  0 (0.0000%)  -4 (-0.0015%)  -156 (-0.0110%)                                  285632
arducopter-heli  212 (+0.0130%)   0 (0.0000%)  4 (+0.0015%)   212 (+0.0130%)                                    72244
arduplane        -148 (-0.0092%)  0 (0.0000%)  -4 (-0.0015%)  -148 (-0.0092%)                                   89068
arducopter       148 (+0.0091%)   0 (0.0000%)  4 (+0.0015%)   148 (+0.0091%)                                    70188
antennatracker   -24 (-0.0021%)   0 (0.0000%)  0 (0.0000%)    -24 (-0.0021%)                                   544220

Pixhawk1-1M - costs all over

Binary Name      Text [B]        Data [B]     BSS (B)        Total Flash Change [B] (%)      Flash Free After PR (B)
---------------  --------------  -----------  -------------  ----------------------------  -------------------------
blimp            52 (+0.0071%)   0 (0.0000%)  -4 (-0.0020%)  52 (+0.0070%)                                    293968
ardurover        100 (+0.0112%)  0 (0.0000%)  -4 (-0.0020%)  100 (+0.0112%)                                   137224
ardusub          56 (+0.0062%)   0 (0.0000%)  0 (0.0000%)    56 (+0.0062%)                                    129440
arducopter-heli  48 (+0.0049%)   0 (0.0000%)  0 (0.0000%)    48 (+0.0049%)                                     50256
arduplane        168 (+0.0164%)  0 (0.0000%)  0 (0.0000%)    168 (+0.0163%)                                     3464
arducopter       16 (+0.0016%)   0 (0.0000%)  0 (0.0000%)    16 (+0.0016%)                                     54416
antennatracker   -4 (-0.0006%)   0 (0.0000%)  -4 (-0.0020%)  -4 (-0.0006%)                                    312960

I have no idea....

[peterbarker]

LGTM

[peterbarker]

This vector is implicitly zero