[Intel-gfx] [PATCH] drm: Simplify return value handling in

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
-------------------------------------Summary-------------------------------------
Platform: baseline_drm_intel_nightly_pass_rate->patch_applied_pass_rate
BYT: pass/total=291/291->291/291
PNV: pass/total=356/356->356/356
ILK: pass/total=372/372->371/372
IVB: pass/total=545/546->545/546
SNB: pass/total=380/380->379/380
HSW: pass/total=579/579->579/579
BDW: pass/total=422/423->422/423
-------------------------------------Detailed-------------------------------------
test_platform: test_suite, test_case, result_with_drm_intel_nightly(count, machine_id...)...->result_with_patch_applied(count, machine_id)...
ILK: Intel_gpu_tools, igt_kms_setmode_invalid-clone-single-crtc, TIMEOUT(6, M37M6)PASS(1, M26) -> TIMEOUT(1, M37)PASS(3, M37)
IVB: Intel_gpu_tools, igt_gem_bad_reloc_negative-reloc, NSPT(3, M21M34)PASS(4, M34M21) -> NSPT(1, M34)PASS(3, M34)
IVB: Intel_gpu_tools, igt_kms_setmode_invalid-clone-single-crtc, TIMEOUT(5, M34M21)PASS(1, M21) -> TIMEOUT(1, M34)PASS(3, M34)
SNB: Intel_gpu_tools, igt_kms_setmode_invalid-clone-single-crtc, TIMEOUT(4, M35M22)PASS(1, M35) -> TIMEOUT(1, M35)PASS(3, M35)
BDW: Intel_gpu_tools, igt_gem_reset_stats_ban-bsd, DMESG_WARN(1, M28)PASS(6, M42M30) -> PASS(4, M42)
BDW: Intel_gpu_tools, igt_kms_setmode_invalid-clone-single-crtc, TIMEOUT(6, M42M30)PASS(1, M28) -> TIMEOUT(1, M42)PASS(3, M42)