[media] tm6000: check an allocation for failure

This allocation had no error checking. It didn't need to be under
the mutex so I moved it out form there. That makes the error handling
easier and is a potential speed up.

Signed-off-by: Dan Carpenter <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/usb/tm6000/tm6000-core.c

···
 	u8	     *data = NULL;
 	int delay = 5000;
 
-	mutex_lock(&dev->usb_lock);
-
-	if (len)
+	if (len) {
 		data = kzalloc(len, GFP_KERNEL);
+		if (!data)
+			return -ENOMEM;
+	}
+
+	mutex_lock(&dev->usb_lock);
 
 	if (req_type & USB_DIR_IN)
 		pipe = usb_rcvctrlpipe(dev->udev, 0);