cifs: Only free DFS target list if we actually got one

Fix potential NULL ptr deref when DFS target list is empty.

Signed-off-by: Paulo Alcantara <palcantara@suse.de>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
1 file changed