compiler warning

warning: suggest a space before ‘;’ or explicit braces around empty body in ‘for’ statement

extra/mariabackup/backup_copy.cc

@@ -654,7 +654,7 @@ mkdirp(const char *pathname, int Flags, myf MyFlags)
 	parent[len-1]= 0;
 
 	for (p = parent + strlen(parent);
-	    !is_path_separator(*p) && p != parent; p--);
+	    !is_path_separator(*p) && p != parent; p--) ;
 
 	*p = 0;