A NULL error response might be a valid case where smb2_reconnect()
failed to reconnect the session and tcon due to a disconnected server
prior to issuing the I/O operation, so don't leak -ENOMEM to userspace
on such occasions.
Fixes: 76894f3e2f71 ("cifs: improve symlink handling for smb2+") Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz> Signed-off-by: Steve French <stfrench@microsoft.com>