Minor amdgpu clean ups on top of 4.7rc6 (V.2)

[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.

V.2 of this series picks up a couple of other cases that I missed
and dropping the 'drivers/amdgpu: Trim down some unnecessary braces'
patch for now.

Please review,

Edward O'Callaghan (8):

  [PATCH 1/8] drivers/amdgpu: Remove spurious semicolons
  [PATCH 2/8] drivers/amdgpu: Use 'true/false' for bool typed variables
  [PATCH 3/8] drivers/amdgpu: Use canonical form in branch predicates
  [PATCH 4/8] drivers/amdgpu: Use kmemdup instead of kmalloc + memcpy
  [PATCH 5/8] drivers/amdgpu: Remove redundant NULL check before
  [PATCH 6/8] drivers/amdgpu: Remove redundant casts on kzalloc() calls
  [PATCH 7/8] drivers/amdgpu: Use canonical boolean form in various
  [PATCH 8/8] drivers/amdgpu: Remove redundant itermediate return val