ftp: use int for sent to preserve SSL_write()

SSL_write() returns int and uses negative values to indicate errors.
The variable sent, which stores the result of SSL_write(), was
declared as size_t, causing negative values to be converted into
large positive values. Although the value is later converted back
when passed to SSL_get_error, using int makes the code
cleaner and more consistent with the SSL_write() contract.

Author: zeff-ir

ext/ftp/ftp.c

@@ -1320,7 +1320,7 @@ static int single_send(ftpbuf_t *ftp, php_socket_t s, void *buf, size_t size) {
 	bool retry = 0;
 	SSL *handle = NULL;
 	php_socket_t fd;
-	size_t sent;
+	int sent;
 
 	if (ftp->use_ssl && ftp->fd == s && ftp->ssl_active) {
 		handle = ftp->ssl_handle;