In vnet_port_probe() and vsw_port_probe(), we should
check the return value of mdesc_grab() as it may
return NULL which can caused NPD bugs.

Fixes: 5d01fa0c ("ldmvsw: Add ldmvsw.c driver code")
Fixes: 43fdf274 ("[SPARC64]: Abstract out mdesc accesses for better MD update handling.")
Signed-off-by: NLiang He <windhl@126.com>
Reviewed-by: NPiotr Raczynski <piotr.raczynski@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>