Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|--- a/sys/bus/u4b/audio/uaudio_pcm.c
|+++ b/sys/bus/u4b/audio/uaudio_pcm.c
--------------------------
Patching file sys/bus/u4b/audio/uaudio_pcm.c using Plan A...
Hunk #1 succeeded at 136.
Hunk #2 succeeded at 156.
done
PATCH-OK
139:	if (lockstatus(lock, curthread) == LK_EXCLUSIVE) {
159:	if (lockstatus(lock, curthread) == LK_EXCLUSIVE) {
cc  -O2 -pipe   -D_KERNEL -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith -Wcast-qual  -Wold-style-definition -Wmissing-include-dirs  -Wno-pointer-sign -Winit-self -Wundef -Wno-unused-but-set-variable -std=gnu11 -Werror -DKLD_MODULE -nostdinc  -I. -Idragonfly -I/usr/obj/usr/src/sys/bus/u4b/audio/forwarder_x86_64/include -Idragonfly/../include -I/usr/include  -Wold-style-declaration -fno-common -ffreestanding -fno-stack-protector -fno-strict-aliasing -fno-strict-overflow -fno-asynchronous-unwind-tables -fno-omit-frame-pointer -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float -mno-fp-ret-in-387 -mindirect-branch=thunk-inline   -c /usr/src/sys/bus/u4b/audio/uaudio_pcm.c
cc  -O2 -pipe   -D_KERNEL -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith -Wcast-qual  -Wold-style-definition -Wmissing-include-dirs  -Wno-pointer-sign -Winit-self -Wundef -Wno-unused-but-set-variable -std=gnu11 -Werror -DKLD_MODULE -nostdinc  -I. -Idragonfly -I/usr/obj/usr/src/sys/bus/u4b/audio/forwarder_x86_64/include -Idragonfly/../include -I/usr/include  -Wold-style-declaration -fno-common -ffreestanding -fno-stack-protector -fno-strict-aliasing -fno-strict-overflow -fno-asynchronous-unwind-tables -fno-omit-frame-pointer -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float -mno-fp-ret-in-387 -mindirect-branch=thunk-inline   -c /usr/src/sys/bus/u4b/audio/uaudio.c
cc -Wl,--build-id=sha1 -nostdlib -Wl,--hash-style=sysv   -r -Wl,-d -o uaudio.ko uaudio_pcm.o uaudio.o
-rw-r--r--  1 root  wheel  66096 Oct  8 14:15 /usr/obj/usr/src/sys/bus/u4b/audio/uaudio.ko