net: Fix slip compilation issue with debug option enabled

Slip context parameter is not used in hexdump and in few places
it is not defined. So CONFIG_SLIP_DEBUG=y throws errors.

Change-Id: I73ca26b7d5cd7c3cd532462b5300e25bbdac9511
Signed-off-by: Ravi kumar Veeramally <ravikumar.veeramally@linux.intel.com>
1 file changed