vfs: clarify and clean up dentry_cmp()

It did some odd things for unclear reasons.  As this is one of the
functions that gets changed when doing word-at-a-time compares, this is
yet another of the "don't change any semantics, but clean things up so
that subsequent patches don't get obscured by the cleanups".
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/dcache.h

@@ -54,18 +54,17 @@ extern struct dentry_stat_t dentry_stat;
 static inline int dentry_cmp(const unsigned char *cs, size_t scount,
 				const unsigned char *ct, size_t tcount)
 {
-	int ret;
 	if (scount != tcount)
 		return 1;
+
 	do {
-		ret = (*cs != *ct);
-		if (ret)
-			break;
+		if (*cs != *ct)
+			return 1;
 		cs++;
 		ct++;
 		tcount--;
 	} while (tcount);
-	return ret;
+	return 0;
 }
 
 /* Name hashing routines. Initial hash value */