Fixed an unused param warning

libnetutils had a single warning. Fixed it to make it clean.

Change-Id: I9297e556657a38dbdd7d1d0ac4bc3574801d5ac9
Author: Edwin Vane <edwin.vane@intel.com>
Reviewed-by: Kevin P Schoedel <kevin.p.schoedel@intel.com>
Decode DHCP netmask option correctly

Signed-off-by: Chris Dearman <chris@mips.com>
Change-Id: Ibc288458baf2f75c5b19a46e4c97ee59521cc9a5

Conflicts:
	libnetutils/ifc_utils.c