9p: v9fs_fid_add() can't fail now

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/9p/fid.c b/fs/9p/fid.c
index ddf6189..73ca550 100644
--- a/fs/9p/fid.c
+++ b/fs/9p/fid.c
@@ -41,12 +41,11 @@
  *
  */
 
-int v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid)
+void v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid)
 {
 	spin_lock(&dentry->d_lock);
 	hlist_add_head(&fid->dlist, (struct hlist_head *)&dentry->d_fsdata);
 	spin_unlock(&dentry->d_lock);
-	return 0;
 }
 
 /**