DisposPixPat
#include <Quickdraw.h> Color Quickdraw
PixPatHandle thePpat ; the pixel pattern to release from memory data handle, the pixMap's handle, and the expanded data handle. Use this only
when you are completely finished with the pixel pattern.
thePpat is the handle of the pixel pattern to dispose.
Notes: After using this function, the value of thePpat (the pixel pattern's
handle) is meaningless. Be sure NOT to use the pattern handle again, unless
you create a new pixPat structure and assign it to thePpat via NewPixPat.