dcache: d_find_alias needn't recheck IS_ROOT && DCACHE_DISCONNECTED

If we get to this point and discover the dentry is not a root dentry, or
not DCACHE_DISCONNECTED--great, we always prefer that anyway.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/dcache.c

@@ -765,13 +765,10 @@ static struct dentry *__d_find_alias(struct inode *inode)
 		alias = discon_alias;
 		spin_lock(&alias->d_lock);
 		if (S_ISDIR(inode->i_mode) || !d_unhashed(alias)) {
-			if (IS_ROOT(alias) &&
-			    (alias->d_flags & DCACHE_DISCONNECTED)) {
 			__dget_dlock(alias);
 			spin_unlock(&alias->d_lock);
 			return alias;
 		}
-		}
 		spin_unlock(&alias->d_lock);
 		goto again;
 	}