Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff --git a/slock.c b/slock.c
|index c9cdee2..03e191d 100644
|--- a/slock.c
|+++ b/slock.c
--------------------------
Patching file slock.c using Plan A...
Hunk #1 succeeded at 149.
done