Cleanup. (#3488)

examples/50-headless/headless.cpp

@@ -221,6 +221,7 @@ int _main_(int _argc, char** _argv)
 		}
 
 		bimg::imageWriteTga(&writer, kWidth, kHeight, kWidth*4, data, false, false, &err);
+		bx::close(&writer);
 
 		bx::free(&allocator, data);
 	}

src/bgfx_p.h

@@ -2184,7 +2184,7 @@ namespace bgfx
 			constexpr uint32_t kMaxOffset = ( (kOffsetMask>>kOffsetShift) + 1)<<4;
 
 			BX_ASSERT(true
-				&& m_size   < kMaxSize
+				&& uint32_t(m_size) < kMaxSize
 				&& m_offset < kMaxOffset
 				, "UniformCacheKey couldn't fit size or offest (size %d max %d, offset %d max %d)!"
 				, m_size