fix size_t signed comparison

Author: krakjoe

ext/readline/readline_cli.c

@@ -106,7 +106,8 @@ static size_t readline_shell_ub_write(const char *str, size_t str_length) /* {{{
 	   caller (sapi_cli_single_write in sapi/cli) which will actually
 	   write due to -1 return code */
 	php_last_char = str[str_length-1];
-	return -1;
+
+	return (size_t) -1;
 }
 /* }}} */
 

sapi/cli/php_cli.c

@@ -304,7 +304,7 @@ static size_t sapi_cli_ub_write(const char *str, size_t str_length) /* {{{ */
 	if (cli_shell_callbacks.cli_shell_ub_write) {
 		size_t ub_wrote;
 		ub_wrote = cli_shell_callbacks.cli_shell_ub_write(str, str_length);
-		if (ub_wrote > -1) {
+		if (ub_wrote != (size_t) -1) {
 			return ub_wrote;
 		}
 	}