innodb_check_for_record_too_big_error(): Divide the return value of

page_get_free_space_of_empty_noninline() by 2.  Until r1571, that function
did not return the same value as page_get_free_space_of_empty().

handler/ha_innodb.cc

@@ -4518,9 +4518,8 @@ innodb_check_for_record_too_big_error(
 	int	error)	/* in: error code to check */
 {
 	if (error == (int)DB_TOO_BIG_RECORD) {
-		ulint		max_row_size;
-
-		max_row_size = page_get_free_space_of_empty_noninline(comp);
+		ulint	max_row_size
+			= page_get_free_space_of_empty_noninline(comp) / 2;
 
 		my_error(ER_TOO_BIG_ROWSIZE, MYF(0), max_row_size);
 	}