drm/bridge/tc358775: Remove unneeded semicolon

Fixes coccicheck warning:

drivers/gpu/drm/bridge/tc358775.c:488:2-3: Unneeded semicolon

Signed-off-by: Zheng Bin <zhengbin13@huawei.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200909121900.103712-1-zhengbin13@huawei.com