igt_debugfs.c: In function 'igt_drop_caches_has':
igt_debugfs.c:890:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result]
   fscanf(file, "0x%" PRIx64, &mask);
         ^
  CC       igt_aux.lo
  CC       igt_gt.lo
igt_gt.c: In function 'igt_force_gpu_reset':
igt_gt.c:382:8: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result]
  fscanf(file, "%d", &wedged);

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>