TCP profile: report compression error if we fail to build CO packet.
TCP profile: report compression error if we fail to build CO packet.

This way another compression profile could be used, eg. IP-only or
Uncompressed.

didier-barvaux/rohc,didier-barvaux/rohc,didier-barvaux/rohc,didier-barvaux/rohc,didier-barvaux/rohc