typo fixed

extra/replace.c

@@ -282,7 +282,7 @@ int insert_pointer_name(reg1 POINTER_ARRAY *pa,my_string name)
     pa->max_length=(pa->length+length+MALLOC_OVERHEAD+PS_MALLOC-1)/PS_MALLOC;
     pa->max_length=pa->max_length*PS_MALLOC-MALLOC_OVERHEAD;
     if (!(new_pos= (byte*) my_realloc((gptr) pa->str,
-				      (uint) (pa->max_length+PS_MALLOC),
+				      (uint) pa->max_length,
 				      MYF(MY_WME))))
       DBUG_RETURN(1);
     if (new_pos != pa->str)