hv_netvsc: Fix error handling in netvsc_set_features()

When an error is returned by rndis_filter_set_offload_params(), we should
still assign the unaffected features to ndev->features. Otherwise, these
features will be missing.

Fixes: d6792a5a ("hv_netvsc: Add handler for LRO setting change")
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>