cifs: Remove the superfluous break

Remove the superfuous break, as there is a 'return' before it.

Signed-off-by: Liao Pingfang <[e-mail]>
Signed-off-by: Yi Wang <[e-mail]>
Signed-off-by: Steve French <[e-mail]>

fs/cifs/sess.c

···
 #else
 		cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
 		return -ENOSYS;
-		break;
 #endif /* CONFIG_CIFS_UPCALL */
 	case RawNTLMSSP:
 		sess_data->func = sess_auth_rawntlmssp_negotiate;