core: parse_add_spec() free params in case of parsing failure

(cherry picked from commit 5a71429596851d8096de1abe5542e57e8b8f6547)

parser/parse_addr_spec.c

@@ -913,6 +913,7 @@ endofheader:
 	return tmp;
 
 error:
+	free_to_params(to_b);
 	to_b->error=PARSE_ERROR;
 	return tmp;