Slightly optimise file reader

CYD-Klipper/src/core/files_query.cpp

@@ -54,7 +54,9 @@ FILESYSTEM_FILE* get_files(int limit){
                 file_iter++;
             }
 
-            // Little inefficient as it always allocates a string, even if it doesn't have to
+            if (file_iter == files.end() && files.size() >= limit)
+                continue;
+            
             f.name = (char*)malloc(strlen(path) + 1);
             if (f.name == NULL){
                 Serial.println("Failed to allocate memory");