Minor amdgpu clean ups on top of 4.7rc6

[Edward O'Callaghan]

This series are just minor cleanup patches, the first 3 are trival.
This series applies on top of 4.7rc6 and should not make any direct
functional changes.

Please review,


Edward O'Callaghan (5):

  [PATCH 1/5] drivers/amdgpu: Remove spurious semicolons
  [PATCH 2/5] drivers/amdgpu: enable_nb_ps_policy is bool so use
  [PATCH 3/5] drivers/amdgpu: Use canonical form in branch predicates
  [PATCH 4/5] drivers/amdgpu: Use kmemdup instead of kmalloc + memcpy
  [PATCH 5/5] drivers/amdgpu: Remove redundant NULL check before