Check memory leak in nuttx

[seanshpark]

tuvtester running in nuttx.

First run

nsh> free
             total       used       free    largest
Mem:        165104      13136     151968      97376

Second run

nsh> free
             total       used       free    largest
Mem:        165104      13472     151632      97376

[seanshpark]

Testing with valgrind / linux reports no leaks.

[seanshpark]

When pipe() is called /dev/pipe%d device is created with register_driver() for the pipe but is not removed when both handles are closed. As device can be reused it is OK not to unregister for performance. But it's confusing whether there is other memory leak or not.

[seanshpark]

Memory leak is fixed for linux and also for nuttx. There was one for linux when checked with valgrind.
For nuttx, as /dev/pipe? file allocates memory, should have to delete the file to check the leak.
But as there is some problem with g_pipeset in nuttx/drivers/pipes/pipe.c sync with pipecommon_freedev() call, second run of tuvtester fails.