Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff --git dwm.c dwm.c
|index 5e4d494..bdb1446 100644
|--- dwm.c
|+++ dwm.c
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 170.
Hunk #2 succeeded at 873.
Hunk #3 succeeded at 1797.
done