zdev/dracut: put temporary files under the subdir ${DRACUT_TMPDIR}

This way, dracut cleans up everything just in case the "rm" here fails.

Github-ID: #158
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Acked-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Acked-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

zdev/dracut/95zdev-kdump/module-setup.sh

@@ -88,7 +88,7 @@ install() {
         done
     fi
 
-    _tempfile=$(mktemp --tmpdir dracut-zdev.XXXXXX)
+    _tempfile=$(mktemp --tmpdir="${DRACUT_TMPDIR}" dracut-zdev.XXXXXX)
 
     # work with systems that are not based on chzdev persistent config
     local _configuration="--active"

zdev/dracut/95zdev/module-setup.sh

@@ -103,7 +103,7 @@ install() {
     # shellcheck disable=SC2154
     [[ $hostonly ]] || return 0
 
-    _tempfile=$(mktemp --tmpdir dracut-zdev.XXXXXX)
+    _tempfile=$(mktemp --tmpdir="${DRACUT_TMPDIR}" dracut-zdev.XXXXXX)
     function check_zdev() {
         local _dev=$1
         local _devsysfs _bdevpath