package/systemd: fix wrong variable name in comment

There is no such thing as a BR2_TARGET_GENERIC_TTY_PATH variable. The
comment here should mention BR2_TARGET_GENERIC_GETTY_PORT instead.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit e0ff6ad7ff6fb5c4643314b9e029f81cc3b07762)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/systemd/systemd.mk

@@ -683,15 +683,15 @@ ifneq ($(call qstrip,$(BR2_TARGET_GENERIC_GETTY_PORT)),)
 # Systemd defaults to enabling getty@tty1.service
 #
 # What we want to do
-# * Enable a getty on $BR2_TARGET_GENERIC_TTY_PATH
+# * Enable a getty on $BR2_TARGET_GENERIC_GETTY_PORT
 # * Set the baudrate for all units according to BR2_TARGET_GENERIC_GETTY_BAUDRATE
 # * Always enable a getty on the console using systemd-getty-generator
 #   (backward compatibility with previous releases of buildroot)
 #
 # What we do
 # * disable getty@tty1 (enabled by upstream systemd)
-# * enable getty@xxx if  $BR2_TARGET_GENERIC_TTY_PATH is a tty
-# * enable serial-getty@xxx for other $BR2_TARGET_GENERIC_TTY_PATH
+# * enable getty@xxx if  $BR2_TARGET_GENERIC_GETTY_PORT is a tty
+# * enable serial-getty@xxx for other $BR2_TARGET_GENERIC_GETTY_PORT
 # * rewrite baudrates if a baudrate is provided
 define SYSTEMD_INSTALL_SERVICE_TTY
 	mkdir -p $(TARGET_DIR)/usr/lib/systemd/system/getty@.service.d; \