Avoid panic during SignedPld parsing (#1552)
Avoid panic during SignedPld parsing (#1552)


Return error if buffer is too small to avoid panic.

netsec-ethz/scion,netsec-ethz/scion,klausman/scion,Oncilla/scion,Oncilla/scion,klausman/scion,klausman/scion,klausman/scion,netsec-ethz/scion,Oncilla/scion,netsec-ethz/scion,klausman/scion,Oncilla/scion