net: cdc_ncm: use tasklet_init() for tasklet_struct init

The tasklet initialisation would be better done by tasklet_init()
instead of assuming all the fields are in an ok state by default.

This does not fix any actual know bug.
Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/usb/cdc_ncm.c

@@ -779,8 +779,7 @@ int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_
 
 	hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 	ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
-	ctx->bh.data = (unsigned long)dev;
-	ctx->bh.func = cdc_ncm_txpath_bh;
+	tasklet_init(&ctx->bh, cdc_ncm_txpath_bh, (unsigned long)dev);
 	atomic_set(&ctx->stop, 0);
 	spin_lock_init(&ctx->mtx);