Fix defect reported by Coverity Scan.
Missing varargs init or cleanup (VARARGS)
missing_va_end: va_end was not called for ap.
Fixes: f8b584d6a5 ("vulkan/runtime,radv: Add shared BVH building framework")
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32858>