[Intel-gfx] [PATCH] drm/i915: Remove bogus locking check in the hangcheck code

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5702
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                                  283/283              283/283
ILK                 -1              319/319              318/319
SNB              +1-1              322/346              322/346
IVB              +1-1              382/384              382/384
BYT                                  296/296              296/296
HSW              +1                 425/428              426/428
BDW                 -1              319/333              318/333
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
 ILK  igt_gem_unfence_active_buffers      DMESG_WARN(1, M37)PASS(3, M26)      DMESG_WARN(1, M37)
*SNB  igt_kms_flip_event_leak      NSPT(7, M35M22)      PASS(1, M35)
*SNB  igt_kms_flip_single-buffer-flip-vs-dpms-off-vs-modeset      PASS(2, M35)      NSPT(1, M35)
*IVB  igt_gem_pwrite_pread_snooped-copy-performance      PASS(3, M34)      DMESG_WARN(1, M34)
 IVB  igt_gem_pwrite_pread_snooped-pwrite-blt-cpu_mmap-performance      DMESG_WARN(11, M34M21)PASS(10, M4M34)      PASS(1, M34)
 HSW  igt_gem_pwrite_pread_snooped-pwrite-blt-cpu_mmap-performance      DMESG_WARN(3, M40)PASS(24, M40M20)      PASS(1, M40)
*BDW  igt_gem_fence_thrash_bo-write-verify-threaded-none      PASS(3, M30)      DMESG_WARN(1, M30)
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