ceph: fix dentry reference leak in encode_fh()

Call to d_find_alias() needs a corresponding dput()

This fixes http://tracker.newdream.net/issues/3271Signed-off-by: David Zafman <david.zafman@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>

fs/ceph/export.c

@@ -90,6 +90,8 @@ static int ceph_encode_fh(struct inode *inode, u32 *rawfh, int *max_len,
 		*max_len = handle_length;
 		type = 255;
 	}
+	if (dentry)
+		dput(dentry);
 	return type;
 }