More verbose error message.

fuse/pathfilesystem.go

@@ -120,7 +120,7 @@ func (me *inode) setParent(newParent *inode) {
 		me.Parent = newParent
 		ch := me.Parent.Children[me.Name]
 		if ch != nil {
-			panic(fmt.Sprintf("Already have an inode with same name: %v.", me.Name))
+			panic(fmt.Sprintf("Already have an inode with same name: %v: %v", me.Name, ch))
 		}
 
 		me.Parent.Children[me.Name] = me