Merge branch 'drm-next-4.15-dc' of git://people.freedesktop.org/~agd5f/linux into drm-next

A bunch of smatch fixes for the dc code.

* 'drm-next-4.15-dc' of git://people.freedesktop.org/~agd5f/linux:
  amd/display: Fix potential null dereference in dce_calcs.c
  amdgpu/dm: Remove unused forward declaration
  drm/amdgpu: Remove unused dc_stream from amdgpu_crtc
  amdgpu/dc: Fix double unlock in amdgpu_dm_commit_planes
  amdgpu/dc: Fix missing null checks in amdgpu_dm.c
  amdgpu/dc: Fix potential null dereferences in amdgpu_dm.c
  amdgpu/dc: fix more indentation warnings
  amdgpu/dc: handle allocation failures in dc_commit_planes_to_stream.
  amdgpu/dc: fix indentation warning from smatch.
  amdgpu/dc: fix non-ansi function decls.
  drm/amd/display: remove some unneeded code
  drm/amd/display: checking for NULL instead of IS_ERR()
  drm/amd/display: small cleanup in destruct()