Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|Only in dwm-6.2-patched: config.h
|Only in dwm-6.2-patched: drw.o
|Only in dwm-6.2-patched: dwm
|diff -up dwm-6.2/dwm.c dwm-6.2-patched/dwm.c
|--- dwm-6.2/dwm.c	2019-02-02 13:55:28.000000000 +0100
|+++ dwm-6.2-patched/dwm.c	2021-05-03 16:21:31.571201407 +0200
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 233.
Hunk #2 succeeded at 2125.
Hunk #3 succeeded at 2154.
Hmm...  Ignoring the trailing garbage.
done