drm/xe: avoid function cast warnings

clang-16 warns about a cast between incompatible function types:

drivers/gpu/drm/xe/xe_range_fence.c:155:10: error: cast from 'void (*)(const void *)' to 'void (*)(struct xe_range_fence *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict]
  155 |         .free = (void (*)(struct xe_range_fence *rfence)) kfree,
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Avoid this with a trivial helper function that calls kfree() here.

v2:
- s/* rfence/*rfence/ (Thomas)

Fixes: 845f64bdbfc9 ("drm/xe: Introduce a range-fence utility")
Signed-off-by: Arnd Bergmann <[email protected]>
Reviewed-by: Thomas Hellström <[email protected]>
Signed-off-by: Thomas Hellström <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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