[PATCH] d3dcompiler: Use return value in read_dword.

[Jacek Caban]

Fixes warnings like on clang with MSVC target, where enums may be signed:
dlls/d3dcompiler_43/reflection.c:1160:22: warning: passing 
'D3D_PRIMITIVE *' (aka 'enum D3D_PRIMITIVE *') to parameter of type 
'DWORD *' (aka 'unsigned int *') converts between pointers to integer 
types with different sign [-Wpointer-sign]

Signed-off-by: Jacek Caban 
---
  dlls/d3dcompiler_43/d3dcompiler_private.h |   8 +-
  dlls/d3dcompiler_43/reflection.c          | 144 +++++++++++-----------
  dlls/d3dcompiler_43/utils.c               |  14 +--
  3 files changed, 84 insertions(+), 82 deletions(-)