[Patch] selinux: remove a useless return

[Amerigo Wang <amwang@redhat.com>]

The last return is unreachable, remove the 'return'
in default, let it fall through.

Signed-off-by: WANG Cong <amwang@redhat.com>
Cc: James Morris <jmorris@namei.org>
Cc: Eric Paris <eparis@parisplace.org>

---

diff --git a/security/selinux/ss/mls.c b/security/selinux/ss/mls.c
index b5407f1..718823d 100644
--- a/security/selinux/ss/mls.c
+++ b/security/selinux/ss/mls.c
@@ -542,7 +542,7 @@ int mls_compute_sid(struct context *scontext,
 		/* Use the process effective MLS attributes. */
 		return mls_context_cpy_low(newcontext, scontext);
 	default:
-		return -EINVAL;
+		/* Fallthrough */
 	}
 	return -EINVAL;
 }