HID: amd_sfh: Add NULL check for hid device

On removal of hid device during SFH set report may cause NULL pointer
exception. Hence add NULL check for hid device before accessing.

Fixes: 4b2c53d9 ("SFH:Transport Driver to add support of AMD Sensor Fusion Hub (SFH)")
Signed-off-by: NBasavaraj Natikar <Basavaraj.Natikar@amd.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

drivers/hid/amd-sfh-hid/amd_sfh_hid.c

@@ -101,11 +101,15 @@ static int amdtp_wait_for_response(struct hid_device *hid)
 
 void amdtp_hid_wakeup(struct hid_device *hid)
 {
-	struct amdtp_hid_data *hid_data = hid->driver_data;
-	struct amdtp_cl_data *cli_data = hid_data->cli_data;
+	struct amdtp_hid_data *hid_data;
+	struct amdtp_cl_data *cli_data;
 
-	cli_data->request_done[cli_data->cur_hid_dev] = true;
-	wake_up_interruptible(&hid_data->hid_wait);
+	if (hid) {
+		hid_data = hid->driver_data;
+		cli_data = hid_data->cli_data;
+		cli_data->request_done[cli_data->cur_hid_dev] = true;
+		wake_up_interruptible(&hid_data->hid_wait);
+	}
 }
 
 static struct hid_ll_driver amdtp_hid_ll_driver = {