Remove version argument check from initramfs cleanup script (#3859)

The version argument is not used by the script anymore, hence the check is obsolete.

Additionally make use of the currently unused defined MOD_DIR variable.

Signed-off-by: MichaIng <micha@dietpi.com>

packages/bsp/common/etc/kernel/postinst.d/xx-initramfs-cleanup

@@ -1,15 +1,7 @@
 #!/bin/sh
 
-version="$1"
-
 [ -x /usr/sbin/update-initramfs ] || exit 0
 
-# passing the kernel version is required
-if [ -z "$version" ]; then
-	echo >&2 "W: initramfs-tools: ${DPKG_MAINTSCRIPT_PACKAGE:-kernel package} did not pass a version number"
-	exit 0
-fi
-
 # avoid running multiple times
 # This script should be run after the initramfs-tools script
 # and under the same conditions.
@@ -25,7 +17,7 @@ MOD_DIR=/lib/modules/
 files="$(find /boot -maxdepth 1 -name 'initrd.img-*' -o -name 'uInitrd-*')"
 
 for f in $files; do
-	if [ ! -d /lib/modules/"${f#*-}" ]; then
+	if [ ! -d "$MOD_DIR${f#*-}" ]; then
 		echo "Remove unused generated file: $f"; rm $f
 	fi
 done