Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -up a/dwm.c b/dwm.c
|--- a/dwm.c	2020-05-23 00:20:34.877944603 +0200
|+++ b/dwm.c	2020-06-22 12:49:55.298859682 +0200
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 111.
Hunk #2 succeeded at 131.
Hunk #3 succeeded at 273.
Hunk #4 succeeded at 642.
Hunk #5 succeeded at 653.
Hunk #6 succeeded at 992.
Hunk #7 succeeded at 1535.
Hunk #8 succeeded at 1566.
Hunk #9 succeeded at 1760.
Hunk #10 succeeded at 1808.
Hunk #11 succeeded at 2129.
done