Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff --color -up /tmp/dwm-6.2/dwm.c dwm-6.2/dwm.c
|--- /tmp/dwm-6.2/dwm.c	2019-02-02 14:55:28.000000000 +0200
|+++ dwm-6.2/dwm.c	2020-12-01 12:20:55.584639058 +0200
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 36.
Hunk #2 succeeded at 98.
Hunk #3 succeeded at 794.
Hunk #4 succeeded at 1023.
Hunk #5 succeeded at 1075.
Hunk #6 succeeded at 1755.
Hunk #7 succeeded at 1764.
done