drm/panel: jadard-jd9365da-h3: Fix signedness bug

drm/panel: jadard-jd9365da-h3: Fix signedness bug

The function drm_of_get_data_lanes_count_remote() returns negative error
codes and dsi->lanes is an unsigned integer, so the check (dsi->lanes <
0) is always impossible.

Detected by Smatch:
drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c:2959 jadard_dsi_probe()
warn: unsigned 'dsi->lanes' is never less than zero.

Fixes: eb019688f2a97 ("drm/panel: jadard-jd9365da-h3: support variable DSI configuration")
Signed-off-by: Ethan Tidmore <ethantidmore06@gmail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20260429024954.697411-1-ethantidmore06@gmail.com