vfs: Make d_invalidate return void

Now that d_invalidate can no longer fail, stop returning a useless
return code.  For the few callers that checked the return code update
remove the handling of d_invalidate failure.

Reviewed-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/fuse/dir.c

@@ -1286,9 +1286,7 @@ static int fuse_direntplus_link(struct file *file,
 			d_drop(dentry);
 		} else if (get_node_id(inode) != o->nodeid ||
 			   ((o->attr.mode ^ inode->i_mode) & S_IFMT)) {
-			err = d_invalidate(dentry);
-			if (err)
-				goto out;
+			d_invalidate(dentry);
 		} else if (is_bad_inode(inode)) {
 			err = -EIO;
 			goto out;