hv_netvsc: remove redundant assignment in netvsc_recv_callback()

BugLink: http://bugs.launchpad.net/bugs/1616677

net_device_ctx is assigned in the very beginning of the function and 'net'
pointer doesn't change.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 4baa994d)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Brad Figg <brad.figg@canonical.com>
Acked-by: Kamal Mostafa <kamal@canonical.com>

drivers/net/hyperv/netvsc_drv.c

@@ -701,7 +701,6 @@ int netvsc_recv_callback(struct hv_device *device_obj,
 	}
 
 vf_injection_done:
-	net_device_ctx = netdev_priv(net);
 	rx_stats = this_cpu_ptr(net_device_ctx->rx_stats);
 
 	/* Allocate a skb - TODO direct I/O to pages? */