fix defered unlock of pin lock in AddR

This wasn't causing any problems because this function is actually dead
code (but possibly useful?).

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

core/coreunix/add.go

@@ -322,7 +322,7 @@ func AddWithContext(ctx context.Context, n *core.IpfsNode, r io.Reader) (string,
 
 // AddR recursively adds files in |path|.
 func AddR(n *core.IpfsNode, root string) (key string, err error) {
-	n.Blockstore.PinLock().Unlock()
+	defer n.Blockstore.PinLock().Unlock()
 
 	stat, err := os.Lstat(root)
 	if err != nil {