Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/spi/spi-slave-system-control.c b/drivers/spi/spi-slave-system-control.c
index c0257e9..169f3d5 100644
--- a/drivers/spi/spi-slave-system-control.c
+++ b/drivers/spi/spi-slave-system-control.c
@@ -60,6 +60,7 @@
 	case CMD_REBOOT:
 		dev_info(&priv->spi->dev, "Rebooting system...\n");
 		kernel_restart(NULL);
+		break;
 
 	case CMD_POWEROFF:
 		dev_info(&priv->spi->dev, "Powering off system...\n");