Bug 615838 comparison between signed and unsigned integer expressions in nsMediaCache::FlushInternal. r=roc a=roc

content/media/nsMediaCache.cpp

@@ -619,7 +619,7 @@ nsMediaCache::FlushInternal()
 {
   nsAutoMonitor mon(mMonitor);
 
-  for (PRInt32 blockIndex = 0; blockIndex < mIndex.Length(); ++blockIndex) {
+  for (PRUint32 blockIndex = 0; blockIndex < mIndex.Length(); ++blockIndex) {
     FreeBlock(blockIndex);
   }