drm/edid: fix info leak when failing to get panel id

Make sure to clear the transfer buffer before fetching the EDID to
avoid leaking slab data to the logs on errors that leave the buffer
unchanged.

Fixes: 69c7717c ("drm/edid: Dump the EDID when drm_edid_get_panel_id() has an error")
Cc: stable@vger.kernel.org	# 6.2
Cc: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230302074704.11371-1-johan+linaro@kernel.org