drm/probe-helper: Document drm_helper_hpd_irq_event() return value
The documentation of the drm_helper_hpd_irq_event() function didn't document the value that function was returning. Add that part as well. Signed-off-by: Maxime Ripard <maxime@cerno.tech> Reviewed-by: Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20210914101724.266570-1-maxime@cerno.tech
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