Merge pull request #351 from maruncz/sanitizer

`ColorFilterArray::shiftDcrawFilter()`: avoid out-of-bounds shifts

Author: LebedevRI

src/librawspeed/metadata/ColorFilterArray.cpp

@@ -153,7 +153,8 @@ uint32_t ColorFilterArray::shiftDcrawFilter(uint32_t filter, int x, int y) {
   // A shift in y direction means rotating the whole int by 4 bits.
   y *= 4;
   y = y >= 0 ? y % 32 : 32 - ((-y) % 32);
-  filter = (filter >> y) | (filter << (32 - y));
+  if (y != 0)
+    filter = (filter >> y) | (filter << (32 - y));
 
   return filter;
 }