[BLUETOOTH]: Make hidp_setup_input() return int

This patch:
- makes hidp_setup_input() return int to indicate errors;
- checks its return value to handle errors.

And this time it is against -rc7-mm1 tree.

Thanks to roel and Marcel Holtmann for comments.
Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bluetooth/hidp/core.c

@@ -625,7 +625,7 @@ static struct device *hidp_get_device(struct hidp_session *session)
 	return conn ? &conn->dev : NULL;
 }
 
-static inline void hidp_setup_input(struct hidp_session *session, struct hidp_connadd_req *req)
+static inline int hidp_setup_input(struct hidp_session *session, struct hidp_connadd_req *req)
 {
 	struct input_dev *input = session->input;
 	int i;
@@ -667,7 +667,7 @@ static inline void hidp_setup_input(struct hidp_session *session, struct hidp_co
 
 	input->event = hidp_input_event;
 
-	input_register_device(input);
+	return input_register_device(input);
 }
 
 static int hidp_open(struct hid_device *hid)
@@ -820,8 +820,11 @@ int hidp_add_connection(struct hidp_connadd_req *req, struct socket *ctrl_sock,
 	session->flags   = req->flags & (1 << HIDP_BLUETOOTH_VENDOR_ID);
 	session->idle_to = req->idle_to;
 
-	if (session->input)
-		hidp_setup_input(session, req);
+	if (session->input) {
+		err = hidp_setup_input(session, req);
+		if (err < 0)
+			goto failed;
+	}
 
 	if (session->hid)
 		hidp_setup_hid(session, req);