affs: fix missing unlocks in affs_remove_link

In two error cases affs_remove_link doesn't call affs_unlock_dir to
release the i_hash_lock semaphore.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/affs/amigaffs.c

@@ -179,14 +179,18 @@ affs_remove_link(struct dentry *dentry)
 		affs_lock_dir(dir);
 		affs_fix_dcache(dentry, link_ino);
 		retval = affs_remove_hash(dir, link_bh);
-		if (retval)
+		if (retval) {
+			affs_unlock_dir(dir);
 			goto done;
+		}
 		mark_buffer_dirty_inode(link_bh, inode);
 
 		memcpy(AFFS_TAIL(sb, bh)->name, AFFS_TAIL(sb, link_bh)->name, 32);
 		retval = affs_insert_hash(dir, bh);
-		if (retval)
+		if (retval) {
+			affs_unlock_dir(dir);
 			goto done;
+		}
 		mark_buffer_dirty_inode(bh, inode);
 
 		affs_unlock_dir(dir);