Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|Author: Jan Christoph Ebersbach <jceb@e-jc.de>,
|        Troy Sankey <sankeytms@gmail.com>
|This modified pertag patch keeps the bar static.  It is based on Jan
|Christoph Ebersbach's dwm-pertag-6.0.diff.
|
|diff --git a/dwm.c b/dwm.c
|index 1d78655..bd0a7d9 100644
|--- a/dwm.c
|+++ b/dwm.c
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 124.
Hunk #2 succeeded at 144.
Hunk #3 succeeded at 289.
Hunk #4 succeeded at 656.
Hunk #5 succeeded at 668.
Hunk #6 succeeded at 1054.
Hunk #7 succeeded at 1581.
Hunk #8 succeeded at 1605.
Hunk #9 succeeded at 1792.
Hunk #10 succeeded at 2090.
done