gpu: Fix a memory tracking bug with kmallocs.

If a kmalloc was made by one PID and freed by another, it would not be
tracked correctly and appeared to leak. The memory did not actually leak.

Bug: 38184708

Change-Id: Ia293c210de6b01f2e909a0f3f05d21319151d9a5
Signed-off-by: Alistair Strachan <alistair.strachan@imgtec.com>
1 file changed