hv/netvsc: Fix NULL dereference at single queue mode fallback

hv/netvsc: Fix NULL dereference at single queue mode fallback

commit b19b46346f483ae055fa027cb2d5c2ca91484b91 upstream.

The recent commit 916c5e1413be ("hv/netvsc: fix handling of fallback
to single queue mode") tried to fix the fallback behavior to a single
queue mode, but it changed the function to return zero incorrectly,
while the function should return an object pointer.  Eventually this
leads to a NULL dereference at the callers that expect non-NULL
value.

Fix it by returning the proper net_device object.

Fixes: 916c5e1413be ("hv/netvsc: fix handling of fallback to single queue mode")
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Alakesh Haloi <alakeshh@amazon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>