qlcnic: Fix programming number of arguments in a command.

o Initially we were programming maximum number of arguments.
  Instead we should program number of arguments required in
  a command.
o Maximum number of arguments for 82xx adapter is four. Fix it
  for GET_ESWITCH_STATS command.

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