qlcnic: Initialize mailbox cmd structure to zero

o Uninitialzed fields in mailbox command structure
  caused commands to time out randomly due to garbage
  values so initialize it to zero.

Signed-off-by: Rajesh Borundia <rajesh.borundia@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_common.c
Simple merge