bpf: Fix confusing panic() message

When using a filter with netsniff-ng without libpcap support, e.g.

  $ netsniff-ng --in eth0 tcp or udp

we get the error:

  Cannot compile filter tcp or udp

which isn't correct and might be confusing for the user as the intention
wasn't to specify a filter file but a filter string. Correct the error
message accordingly.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

0 files changed, 0 insertions, 0 deletions