[FL-2811] Fix PVS-Studio warnings (#2142)

Co-authored-by: あく <alleteam@gmail.com>
Co-authored-by: gornekich <n.gorbadey@gmail.com>

lib/toolbox/dir_walk.c

@@ -69,8 +69,11 @@ static DirWalkResult
 
             if(dir_walk_filter(dir_walk, name, &info)) {
                 if(return_path != NULL) {
-                    furi_string_printf(
-                        return_path, "%s/%s", furi_string_get_cstr(dir_walk->path), name);
+                    furi_string_printf( //-V576
+                        return_path,
+                        "%s/%s",
+                        furi_string_get_cstr(dir_walk->path),
+                        name);
                 }
 
                 if(fileinfo != NULL) {