drm/panel: raspberrypi-touchscreen: Prevent double-free

stable inclusion
from stable-5.10.54
commit b91e5b63470d7a2f5225540e8093b06426d00bf9
bugzilla: 175586 https://gitee.com/openeuler/kernel/issues/I4DVDU

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=b91e5b63470d7a2f5225540e8093b06426d00bf9

--------------------------------

[ Upstream commit 7bbcb919 ]

The mipi_dsi_device allocated by mipi_dsi_device_register_full() is
already free'd on release.

Fixes: 2f733d61 ("drm/panel: Add support for the Raspberry Pi 7" Touchscreen.")
Signed-off-by: NMaxime Ripard <maxime@cerno.tech>
Reviewed-by: NSam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210720134525.563936-9-maxime@cerno.techSigned-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c

@@ -447,7 +447,6 @@ static int rpi_touchscreen_remove(struct i2c_client *i2c)
 	drm_panel_remove(&ts->base);
 
 	mipi_dsi_device_unregister(ts->dsi);
-	kfree(ts->dsi);
 
 	return 0;
 }