drm-devel-kmod build failures

From: Michael Butler via freebsd-current <freebsd-current_at_freebsd.org>
Date: Mon, 11 Oct 2021 17:07:08 UTC 
After the latest freebsd version bump in param.h, I tried to rebuild the 
DRM modules. It failed with ..

--- dma-buf.o ---
/usr/ports/graphics/drm-devel-kmod/work/drm-kmod-drm_v5.5.19_4/drivers/dma-buf//dma-buf.c:121:1: 
error: conflicting types for 'dma_buf_stat'
dma_buf_stat(struct file *fp, struct stat *sb,
^
/usr/ports/graphics/drm-devel-kmod/work/drm-kmod-drm_v5.5.19_4/drivers/dma-buf//dma-buf.c:70:18: 
note: previous declaration is here
static fo_stat_t dma_buf_stat;
                  ^
1 error generated.
*** [dma-buf.o] Error code 1

make[3]: stopped in 
/usr/ports/graphics/drm-devel-kmod/work/drm-kmod-drm_v5.5.19_4/linuxkpi
1 error

make[3]: stopped in 
/usr/ports/graphics/drm-devel-kmod/work/drm-kmod-drm_v5.5.19_4/linuxkpi

I get a similar error with drm-current-kmod. What changed?

	imb