[Bug 292192] graphics/drm-66-kmod: fix build with clang 21

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292192

            Bug ID: 292192
           Summary: graphics/drm-66-kmod: fix build with clang 21
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: [email protected]
          Reporter: [email protected]
          Assignee: [email protected]
             Flags: maintainer-feedback?([email protected])

With clang 21 graphics/drm-66-kmod fails to compile, with errors similar
to:

    In file included from
/wrkdirs/usr/ports/graphics/drm-66-kmod/work/drm-kmod-drm_v6.6.25_9/drivers/gpu/drm/i915/i915_active.c:12:
   
/wrkdirs/usr/ports/graphics/drm-66-kmod/work/drm-kmod-drm_v6.6.25_9/drivers/gpu/drm/i915/gt/intel_ring.h:63:2:
error: default initialization of an object of type 'typeof (ring->size)' (aka
'const unsigned int') leaves the object uninitialized
[-Werror,-Wdefault-const-init-var-unsafe]
       63 |         typecheck(typeof(ring->size), next);
          |         ^
    /usr/src/sys/compat/linuxkpi/common/include/linux/typecheck.h:31:9: note:
expanded from macro 'typecheck'
       31 | ({      type __var1; \
          |              ^

The thread at https://lkml.org/lkml/2025/5/6/1681 appears to imply that
it is safe to suppress the new -Wdefault-const-init-var-unsafe warning.

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