(0:11) host:/sys/dev/nvme# patch < ~terry/nvme_qpair.c 
Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|--- head/sys/dev/nvme/nvme_qpair.c     2018/03/16 02:46:08     331045
|+++ head/sys/dev/nvme/nvme_qpair.c     2018/03/16 05:23:48     331046
--------------------------
Patching file nvme_qpair.c using Plan A...
Hunk #1 failed at 469.
Hunk #2 succeeded at 407 with fuzz 1 (offset -78 lines).
Hunk #3 failed at 423.
Hunk #4 succeeded at 514 (offset -4 lines).
Hunk #5 failed at 769.
3 out of 5 hunks failed--saving rejects to nvme_qpair.c.rej
done