Fix a few minor warnings. (i was used as a uint32_t in multiple places, like type_member_for_offset, so changed its type)
Fix a few minor warnings. (i was used as a uint32_t in multiple places, like type_member_for_offset, so changed its type)

KhronosGroup/SPIRV-Cross,h3xl3r/SPIRV-Cross,KhronosGroup/SPIRV-Cross,h3xl3r/SPIRV-Cross,KhronosGroup/SPIRV-Cross,KhronosGroup/SPIRV-Cross,KhronosGroup/SPIRV-Cross,KhronosGroup/SPIRV-Cross,h3xl3r/SPIRV-Cross,h3xl3r/SPIRV-Cross,h3xl3r/SPIRV-Cross