branches/5.1: ha_innobase::check_if_incompatible_data(): Check

HA_CREATE_USED_ROW_FORMAT before comparing row_type.  Previously,
the comparison was incorrectly guarded by the presence of an
AUTO_INCREMENT attribute.

handler/ha_innodb.cc

@@ -7935,7 +7935,7 @@ bool ha_innobase::check_if_incompatible_data(
 	}
 
 	/* Check that row format didn't change */
-	if ((info->used_fields & HA_CREATE_USED_AUTO) &&
+	if ((info->used_fields & HA_CREATE_USED_ROW_FORMAT) &&
 		get_row_type() != info->row_type) {
 
 		return COMPATIBLE_DATA_NO;