runner: check bounds on packets in skipPacket.

Our tests shouldn't panic if the program misbehaves.

Change-Id: I113e050222bcf48e5f25883f860dbc1c5c77e77e
Reviewed-on: https://boringssl-review.googlesource.com/5764
Reviewed-by: Adam Langley <agl@google.com>
1 file changed