drm/i915: Make i945gm_vblank_work_func static

drivers/gpu/drm/i915/i915_irq.c:3382:6: warning: symbol 'i945gm_vblank_work_func' was not declared. Should it be static?
  CC [M]  drivers/gpu/drm/i915/i915_irq.o
drivers/gpu/drm/i915/i915_irq.c:3382:6: error: no previous prototype for ‘i945gm_vblank_work_func’ [-Werror=missing-prototypes]
 void i945gm_vblank_work_func(struct work_struct *work)

Jani wrote the idential patch, so for posterity:

The static keyword was apparently accidentally removed in commit
08fa8fd0faa5 ("drm/i915: Switch to per-crtc vblank vfuncs"), leading to
sparse warning:

drivers/gpu/drm/i915/i915_irq.c:3382:6: warning: symbol
'i945gm_vblank_work_func' was not declared. Should it be static?

Make the function static again.

Meanwhile, the 0-day kbuilder also spotted the mistake.

Fixes: 08fa8fd0faa5 ("drm/i915: Switch to per-crtc vblank vfuncs")
Reported-by: kbuild test robot <[email protected]>
Signed-off-by: Chris Wilson <[email protected]>
Signed-off-by: Jani Nikula <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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