db-ctl-base: Fix memory leak of db commands.

Variable "want_key" in function check_condition and variable "key"
in function set_column were not destroyed in exception branch.

This patch calls ovsdb_atom_destroy to release resources to avoid
memory leak.

Fixes: 79c1a00 ("db-ctl-base: Don't die in set_column() on error.")
Fixes: e09b3af ("db-ctl-base: Don't die in is_condition_satisfied() on error")
Acked-by: Simon Horman <horms@ovn.org>
Signed-off-by: Zengyuan Wang <wangzengyuan@huawei.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

lib/db-ctl-base.c

@@ -820,6 +820,7 @@ check_condition(const struct ovsdb_idl_table_class *table,
         type.value.type = OVSDB_TYPE_VOID;
         error = ovsdb_datum_from_string(&b, &type, value_string, symtab);
         if (error) {
+            ovsdb_atom_destroy(&want_key, column->type.key.type);
             goto out;
         }
 
@@ -1368,6 +1369,7 @@ set_column(const struct ovsdb_idl_table_class *table,
         error = ovsdb_atom_from_string(&value, NULL, &column->type.value,
                                        value_string, symtab);
         if (error) {
+            ovsdb_atom_destroy(&key, column->type.key.type);
             goto out;
         }