nat: fix unknown proto translation out2in_ed
nat: fix unknown proto translation out2in_ed

An unknown proto packet can be processed as UDP with destination port
rewriting which breaks the original packet.

With this commit, stop processing unknown proto packets after
nat44_ed_out2in_unknown_proto() execution.

Type: fix

Change-Id: Iea93faf3c282f542d5ee7120c15e1027c1e4abc9
Signed-off-by: Alexander Chernavin <005bca4307cd9b117df45182181fee477edfa768@netgate.com>

chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp