fix ibase connection routine

followup on a7028d9

Author: weltling

ext/interbase/interbase.c

@@ -848,7 +848,7 @@ static char const dpb_args[] = {
 	0, isc_dpb_user_name, isc_dpb_password, isc_dpb_lc_ctype, isc_dpb_sql_role_name, 0
 };
 
-int _php_ibase_attach_db(char **args, int *len, zend_long *largs, isc_db_handle *db) /* {{{ */
+int _php_ibase_attach_db(char **args, size_t *len, zend_long *largs, isc_db_handle *db) /* {{{ */
 {
 	short i, dpb_len, buf_len = 257-2;  /* version byte at the front, and a null at the end */
 	char dpb_buffer[257] = { isc_dpb_version1, 0 }, *dpb;