cxgb4: fix all-mask IP address comparison

Convert all-mask IP address to Big Endian, instead, for comparison.

Fixes: f286dd8e ("cxgb4: use correct type for all-mask IP address comparison")
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>