Fix x86_64 build

src/kits/media/AdapterIO.cpp

@@ -131,7 +131,7 @@ BAdapterIO::_WaitForData(size_t size)
 	if (ret != B_OK)
 		return;
 
-	while(bufferSize < size) {
+	while((size_t)bufferSize < size) {
 		GetSize(&bufferSize);
 		snooze(100000);
 	}

src/kits/media/PluginManager.cpp

@@ -54,7 +54,7 @@ public:
 		if (GetSize(&totalSize) != B_OK)
 			return B_UNSUPPORTED;
 
-		if (position+size < totalSize)
+		if (position+size < (size_t)totalSize)
 			return ReadAt(position, buffer, size);
 
 		return B_NOT_SUPPORTED;