MDEV-29858 Missing DBUG_RETURN or DBUG_VOID_RETURN in fill_schema_proc

mysql-test/main/information_schema_parameters.result

@@ -801,5 +801,9 @@ SHOW STATUS LIKE 'handler_read%next';
 Variable_name	Value
 Handler_read_next	1
 Handler_read_rnd_next	2
+SELECT COUNT(*) FROM information_schema.PARAMETERS
+WHERE SPECIFIC_CATALOG = NULL;
+COUNT(*)
+#
 DROP DATABASE i_s_parameters_test;
 USE test;

mysql-test/main/information_schema_parameters.test

@@ -339,6 +339,10 @@ query_vertical SELECT * FROM INFORMATION_SCHEMA.PARAMETERS
   AND SPECIFIC_NAME = 'процедурка';
 SHOW STATUS LIKE 'handler_read%next';
 
+--replace_column 1 #
+SELECT COUNT(*) FROM information_schema.PARAMETERS
+  WHERE SPECIFIC_CATALOG = NULL;
+
 # Cleanup
 DROP DATABASE i_s_parameters_test;
 USE test;

sql/sql_show.cc

@@ -6804,7 +6804,7 @@ int fill_schema_proc(THD *thd, TABLE_LIST *tables, COND *cond)
   if (get_lookup_field_values(thd, cond, false, tables, &lookup))
   {
     // There can be no matching records for the condition
-    return 0;
+    DBUG_RETURN(0);
   }
 
   start_new_trans new_trans(thd);