pinsched: Remove obsolete ofpbuf_trim().
This call to ofpbuf_trim() comes from a time when the packets passed to
pinsched came directly from a dpif. For some time now that's no longer
true--now they are messages generated by ofputil_encode_packet_in(), which
generally are well sized and do not benefit from trimming.
This is not a bug fix--the code is equally correct either way, it's only
the rationale for trimming that's obsolete.
Signed-off-by: Ben Pfaff <blp@ovn.org>
Acked-by: Jarno Rajahalme <jarno@ovn.org>