Make sure we don't try to dereference the the if_bpf pointer when bpf has not been compiled into the the kernel.
Make sure we don't try to dereference the the if_bpf pointer when bpf has
not been compiled into the the kernel.

Submitted by:	benno

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase