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DF-1163 fix compile-validation (amdgpu gfx_v7_0.c, sys/dev/drm/amd/amdgpu)
Guest: DragonFly 6.5-DEVELOPMENT #0, cc 8.3, with-src (unpatched baseline)
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[1] APPLY fix.diff (7 hunks: fw_dwords decl + cp_dwords + 5 branch datasize + loop guard):
    cd /usr/src && patch -p1 --forward < /root/df1163.diff
      Hunks #1..#7 succeeded; 5 'fw->datasize / 4;' inserts + the bounds guard present.

[2] FULL MODULE BUILD (amdgpu, generates forwarder dir + compiles gfx_v7_0.o):
    cd /usr/src/sys/dev/drm/amd && make   (backgrounded, ~3-4 min)
      -> AMDGPU_MAKE_DONE rc=0
      -> sys/dev/drm/amd/amdgpu/gfx_v7_0.o produced (80360 bytes)
      -> 0 'error:' lines under -Werror (excl the cosmetic missing-include-dirs
         warning that is normal for the first module build and resolves once the
         forwarder dir is generated).

[3] RESULT: fix.diff APPLIES + COMPILES clean (amdgpu module, -Werror).

[4] REVERT (source returned to unpatched baseline):
    cd /usr/src && patch -p1 -R < /root/df1163.diff  -> done
    'datasize / 4;' count -> 0 (clean)

RUNTIME: not exercised -- amdgpu not in GENERIC, no AMD GPU on guest (latent).