drm/meson: Remove unneeded semicolon

Fixes coccicheck warning:

drivers/gpu/drm/meson/meson_plane.c:226:3-4: Unneeded semicolon
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zheng Bin <zhengbin13@huawei.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200424074949.12309-1-zhengbin13@huawei.com

drivers/gpu/drm/meson/meson_plane.c

@@ -223,7 +223,7 @@ static void meson_plane_atomic_update(struct drm_plane *plane,
 			priv->viu.osd1_blk0_cfg[0] |= OSD_BLK_MODE_16 |
 						OSD_COLOR_MATRIX_16_RGB565;
 			break;
-		};
+		}
 	}
 
 	switch (fb->format->format) {