MDEV-19740: Remove a bogus condition

This triggered a "may be uninitialized" warning from GCC 9.2.1.
The bogus-looking condition was added in
7e916bb8

storage/innobase/row/row0sel.cc

@@ -5726,9 +5726,7 @@ row_search_mvcc(
 
 	/*-------------------------------------------------------------*/
 	if (!dict_index_is_spatial(index)) {
-		if (rec) {
-			btr_pcur_store_position(pcur, &mtr);
-		}
+		btr_pcur_store_position(pcur, &mtr);
 	}
 
 lock_table_wait: