MDEV-4665 crash when referencing missing function in a subquery

don't ignore the return value fix_fields()

mysql-test/r/sp_missing_4665.result

+create table t (a int);
+create or replace view v as select 1 from t where a;
+delete from v where (select g());
+ERROR 42000: FUNCTION test.g does not exist
+drop view v;
+drop table t;

mysql-test/t/sp_missing_4665.test

+#
+# MDEV-4665 crash when referencing missing function in a subquery
+#
+create table t (a int);
+create or replace view v as select 1 from t where a;
+--error ER_SP_DOES_NOT_EXIST
+delete from v where (select g());
+drop view v;
+drop table t;

sql/table.cc

@@ -3683,6 +3683,7 @@ bool TABLE_LIST::prep_where(THD *thd, Item **conds,
                                bool no_where_clause)
 {
   DBUG_ENTER("TABLE_LIST::prep_where");
+  bool res= FALSE;
 
   for (TABLE_LIST *tbl= merge_underlying_list; tbl; tbl= tbl->next_local)
   {
@@ -3731,10 +3732,11 @@ bool TABLE_LIST::prep_where(THD *thd, Item **conds,
       if (tbl == 0)
       {
         if (*conds && !(*conds)->fixed)
-	  (*conds)->fix_fields(thd, conds);
-        *conds= and_conds(*conds, where->copy_andor_structure(thd));
-        if (*conds && !(*conds)->fixed)
-          (*conds)->fix_fields(thd, conds);        
+          res= (*conds)->fix_fields(thd, conds);
+        if (!res)
+          *conds= and_conds(*conds, where->copy_andor_structure(thd));
+        if (*conds && !(*conds)->fixed && !res)
+          res= (*conds)->fix_fields(thd, conds);
       }
       if (arena)
         thd->restore_active_arena(arena, &backup);
@@ -3742,7 +3744,7 @@ bool TABLE_LIST::prep_where(THD *thd, Item **conds,
     }
   }
 
-  DBUG_RETURN(FALSE);
+  DBUG_RETURN(res);
 }
 
 /**