drm/panel: drop return code from drm_panel_detach()

There are no errors that can be reported by this function,
so drop the return code.
Fix the only bridge driver that checked the return result.

Signed-off-by: Sam Ravnborg <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>
Cc: Thierry Reding <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Andrzej Hajda <[email protected]>
Cc: Gwan-gyeong Mun <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Linus Walleij <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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