[Intel-gfx] [PATCH] drm/i915: redefine WARN_ON_ONCE to include the condition

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5940
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -6              274/274              268/274
ILK                                  301/301              301/301
SNB                 -1              277/277              276/277
IVB                                  341/341              341/341
BYT                                  287/287              287/287
HSW                                  360/360              360/360
BDW                                  308/308              308/308
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*PNV  igt_gem_userptr_blits_minor-normal-sync      PASS(4)      DMESG_WARN(1)PASS(1)
 PNV  igt_gen3_render_linear_blits      FAIL(3)PASS(3)      FAIL(2)
 PNV  igt_gen3_render_mixed_blits      FAIL(3)PASS(3)      FAIL(2)
 PNV  igt_gen3_render_tiledx_blits      FAIL(5)PASS(2)      FAIL(2)
 PNV  igt_gen3_render_tiledy_blits      FAIL(5)PASS(1)      FAIL(2)
 PNV  igt_gem_tiled_pread_pwrite      FAIL(2)PASS(2)      FAIL(2)
*SNB  igt_gem_mmap_short-mmap      PASS(2)      DMESG_WARN(1)PASS(1)
Note: You need to pay more attention to line start with '*'