package/sysvinit: comment out login line in inittab if getty is disabled

When the "Run a getty" option is disabled, sysvinit doesn't remove the
/etc/inittab line from previous builds. With this patch, the line is
correctly commented out.

Based on similar change made by Stephen Bos <stephen.bos@hagergroup.com>
and Christophe Blaess <christophe.blaess@logilin.fr> for busybox.

Signed-off-by: Carlos Santos <unixmania@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/sysvinit/sysvinit.mk

@@ -36,8 +36,13 @@ define SYSVINIT_SET_GETTY
 	$(SED) '/# GENERIC_SERIAL$$/s~^.*#~$(shell echo $(SYSTEM_GETTY_PORT) | tail -c+4)::respawn:/sbin/getty -L $(SYSTEM_GETTY_OPTIONS) $(SYSTEM_GETTY_PORT) $(SYSTEM_GETTY_BAUDRATE) $(SYSTEM_GETTY_TERM) #~' \
 		$(TARGET_DIR)/etc/inittab
 endef
-SYSVINIT_TARGET_FINALIZE_HOOKS += SYSVINIT_SET_GETTY
+else
+define SYSVINIT_SET_GETTY
+	$(SED) '/# GENERIC_SERIAL$$/s~^.*#~# S0:1:respawn:/sbin/getty -L ttyS0 115200 vt100 #~' \
+		$(TARGET_DIR)/etc/inittab
+endef
 endif # BR2_TARGET_GENERIC_GETTY
+SYSVINIT_TARGET_FINALIZE_HOOKS += SYSVINIT_SET_GETTY
 
 SYSVINIT_TARGET_FINALIZE_HOOKS += SYSTEM_REMOUNT_ROOT_INITTAB