cosmetics & warnings

- remove some unused functions
- move global arrays from data to read only section
- explicitly cast malloc returns; not specifically necessary, but helps
  show intent
- miscellaneous formatting

Change-Id: Ib15fe5b37fe6c29c369ad928bdc3a7290cd13c84

src/mux/muxi.h

@@ -143,8 +143,8 @@ TAG_ID ChunkGetIdFromTag(uint32_t tag);
 WebPChunk* ChunkSearchList(WebPChunk* first, uint32_t nth, uint32_t tag);
 
 // Fill the chunk with the given data & image_info.
-WebPMuxError ChunkAssignDataImageInfo(WebPChunk* chunk, const uint8_t* data,
-                                      uint32_t data_size,
+WebPMuxError ChunkAssignDataImageInfo(WebPChunk* chunk,
+                                      const uint8_t* data, uint32_t data_size,
                                       WebPImageInfo* image_info,
                                       int copy_data, uint32_t tag);