drm/vc4: plane: check drm_gem_plane_helper_prepare_fb() return value

Bubble up any error to the caller.

Signed-off-by: Simon Ser <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Dave Stevenson <[email protected]>
Reviewed-by: Maíra Canal <[email protected]>
Signed-off-by: Maxime Ripard <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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