pathfs: fix logic error in OnRemove

We must match "v.parent" against "parentPI", not against ourself.

This caused entries in the clientInodeMap to never be removed.

Change-Id: Icab14e425105851071a4d95776b4599ba9353a2d

fuse/pathfs/pathfs.go

@@ -371,9 +371,9 @@ func (n *pathInode) OnRemove(parent *nodefs.Inode, name string) {
 		m := n.pathFs.clientInodeMap[n.clientInode]
 
 		idx := -1
-		// Find the entry that has us as the parent
+		// Find the right entry: both "parent" and "name" must match
 		for i, v := range m {
-			if v.parent == n && v.name == name {
+			if v.parent == parentPI && v.name == name {
 				idx = i
 				break
 			}