hv_netvsc: Fix dereference of nvdev before check
hv_netvsc: Fix dereference of nvdev before check

Passes static analysis by Smatch.

Signed-off-by: Andrew Schwartzmeyer <a22b4474de9ac3ccbed81e5dd89fbfba42934a62@microsoft.com>
Signed-off-by: David S. Miller <fe08d3c717adf2ae63592e4c9aec6e3e404d8e3e@davemloft.net>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs