Suppress compiler warning

Marlin/src/sd/cardreader.cpp

@@ -800,7 +800,7 @@ void CardReader::setroot() {
 
       // Never sort more than the max allowed
       // If you use folders to organize, 20 may be enough
-      NOMORE(fileCnt, SDSORT_LIMIT);
+      NOMORE(fileCnt, uint16_t(SDSORT_LIMIT));
 
       // Sort order is always needed. May be static or dynamic.
       #if ENABLED(SDSORT_DYNAMIC_RAM)