tests/gem_fd_exhaustion: Make it work
tests/gem_fd_exhaustion: Make it work

- We need to drop root to actually hit the limits. This requires us to
  fork the actual test since otherwise the exit handlers (which
  require root) fail the entire test.
- Don't assert that the gem create ioctl succeeds, it won't on the
  final run of the loop.

Signed-off-by: Daniel Vetter <c1b6782c4af8f0673da8923a0702a1832e5940f4@ffwll.ch>

erikarn/intel-gpu-tools,mv0/intel-gpu-tools,erikarn/intel-gpu-tools,chenxianqin/intel-gpu-tools,tiagovignatti/intel-gpu-tools,yipdw/intel-gpu-tools,rib/intel-gpu-tools,chenxianqin/intel-gpu-tools,rib/intel-gpu-tools,yipdw/intel-gpu-tools,mv0/intel-gpu-tools,tiagovignatti/intel-gpu-tools,mv0/intel-gpu-tools,dlespiau/checkmate-test-igt,erikarn/intel-gpu-tools,rib/intel-gpu-tools,mv0/intel-gpu-tools,erikarn/intel-gpu-tools,dlespiau/checkmate-test-igt,chenxianqin/intel-gpu-tools,dlespiau/checkmate-test-igt,yipdw/intel-gpu-tools,rib/intel-gpu-tools,tiagovignatti/intel-gpu-tools,yipdw/intel-gpu-tools,chenxianqin/intel-gpu-tools,dlespiau/checkmate-test-igt,tiagovignatti/intel-gpu-tools