[Intel-gfx] [PATCH] drm: Remove redundant code in the getencoder ioctl

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5827
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -1              281/281              280/281
ILK                 -2              308/308              306/308
SNB                 -1              326/326              325/326
IVB                                  380/380              380/380
BYT                                  294/294              294/294
HSW                                  387/421              387/421
BDW                 -1              316/316              315/316
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*PNV  igt_gen3_render_mixed_blits      PASS(6)      CRASH(1)PASS(1)
*ILK  igt_gem_fenced_exec_thrash_no-spare-fences-busy      PASS(2)      DMESG_WARN(1)PASS(1)
*ILK  igt_gem_fenced_exec_thrash_no-spare-fences-busy-interruptible      PASS(2)      DMESG_WARN(1)PASS(1)
*SNB  igt_kms_plane_plane-panning-bottom-right-pipe-B-plane-1      DMESG_WARN(12)PASS(4)      TIMEOUT(1)PASS(1)
*BDW  igt_gem_gtt_hog      PASS(12)      DMESG_WARN(1)PASS(1)
Note: You need to pay more attention to line start with '*'