Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -ruN dwm-6.1-orig/dwm.c dwm-6.1/dwm.c
|--- dwm-6.1-orig/dwm.c	2015-11-08 16:39:37.000000000 -0600
|+++ dwm-6.1/dwm.c	2015-12-14 19:17:19.656091228 -0600
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 227.
Hunk #2 succeeded at 841.
Hunk #3 succeeded at 1386.
Hunk #4 succeeded at 2044.
done