Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -r -u a/dwm.c b/dwm.c
|--- a/dwm.c	2019-02-02 07:55:28.000000000 -0500
|+++ b/dwm.c	2022-01-17 22:38:33.614493243 -0500
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 1291.
Hunk #2 succeeded at 1308.
Hunk #3 succeeded at 1333.
Hunk #4 succeeded at 1346.
done