maintainer-feedback requested: [Bug 239192] graphics/drm-legacy-kmod: fix build on CURRENT with clang

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Bug 239192: graphics/drm-legacy-kmod: fix build on CURRENT with clang
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239192



--- Description ---
With powerpc64 switching to clang in head, I tried to compile drm-legacy with
clang.

It fails with many similar errors:
/tmp/usr/ports/graphics/drm-legacy-kmod/work/drm-legacy-990f64b/src/dev/drm2/dr
m_crtc.c:229:63:
error: passing 'int *' to parameter of type 'uint32_t *' (aka 'unsigned int *')
      converts between pointers to integer types with different sign
[-Werror,-Wpointer-sign]
	ret = drm_gem_name_create(&dev->mode_config.crtc_names, obj, &new_id);
								     ^~~~~~~
Add -Wno-error=pointer-sign to CFLAGS when using new clang.