We try to call free_netvsc_device(net_device) when "net_device" is NULL.
It leads to an Oops.

Fixes: f90251c8a6d0 ('hyperv: Increase the buffer length for 
netvsc_channel_cb()')
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 5b5644a..977984b 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -1054,10 +1054,8 @@ int netvsc_device_add(struct hv_device *device, void 
*additional_info)
        struct net_device *ndev;
 
        net_device = alloc_net_device(device);
-       if (!net_device) {
-               ret = -ENOMEM;
-               goto cleanup;
-       }
+       if (!net_device)
+               return -ENOMEM;
 
        net_device->ring_size = ring_size;
 
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