drm/panel: s6d7aa0: remove the unneeded variable in s6d7aa0_lock

Remove unneeded variable and directly return 0.
Signed-off-by: Wang Jianzheng <wangjianzheng@vivo.com>
Acked-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Reviewed-by: Artur Weber <aweber.kernel@gmail.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230608033446.18412-1-wangjianzheng@vivo.com

drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c

@@ -66,7 +66,6 @@ static void s6d7aa0_reset(struct s6d7aa0 *ctx)
 static int s6d7aa0_lock(struct s6d7aa0 *ctx, bool lock)
 {
 	struct mipi_dsi_device *dsi = ctx->dsi;
-	int ret = 0;
 
 	if (lock) {
 		mipi_dsi_dcs_write_seq(dsi, MCS_PASSWD1, 0xa5, 0xa5);
@@ -80,7 +79,7 @@ static int s6d7aa0_lock(struct s6d7aa0 *ctx, bool lock)
 			mipi_dsi_dcs_write_seq(dsi, MCS_PASSWD3, 0xa5, 0xa5);
 	}
 
-	return ret;
+	return 0;
 }
 
 static int s6d7aa0_on(struct s6d7aa0 *ctx)