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	2015-11-08 17:39:37.000000000 -0500
|+++ b/dwm.c	2022-01-17 22:49:20.598478626 -0500
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 1308.
Hunk #2 succeeded at 1325.
Hunk #3 succeeded at 1351.
Hunk #4 succeeded at 1364.
done