MOTION_PIN conflicts with SELECT_PIN

[bobdoah]

I uncommented the MOTION_PIN and the compile failed with:

Arduino: 1.8.1 (Mac OS X), Board: "Pro Trinket 5V/16MHz (USB)"

/Users/bob/Downloads/Kinetic_POV-master/bikewheel/bikewheel.ino: In function 'void sleep()':
bikewheel:344: error: redeclaration of 'volatile uint8_t* p'
   volatile uint8_t *p = portInputRegister(digitalPinToPort(SELECT_PIN));
                     ^
/Users/bob/Downloads/Kinetic_POV-master/bikewheel/bikewheel.ino:325:21: note: 'volatile uint8_t* p' previously declared here
   volatile uint8_t *p = portInputRegister(digitalPinToPort(MOTION_PIN));
                     ^
exit status 1
redeclaration of 'volatile uint8_t* p'

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

Perhaps it's not possible to use the MOTION_PIN and SELECT_PIN at the same time, but it seems like this could be fixed by declaring the variable with a different name.. but maybe it's not that straightforward?