TT#182450 debian/ngcp-rtpengine-*.postinst: fix shellcheck issues

Fix `SC2043 (warning): This loop will only ever run once. Bad quoting or missing glob/expansion?`

Fix-up for git rev de8b3d59c1,
AKA Change-Id If75b6c1b675c8abf0bb33ae58b41e036276f8640

Change-Id: I46f58da69a683ed2fa67c86f9928fbfc8372482f

debian/ngcp-rtpengine-daemon.postinst

@@ -37,12 +37,11 @@ if [ "$1" = configure ]; then
 		--no-create-home --disabled-password \
 		--group --quiet rtpengine || true
 
-	for DIR in /var/spool/rtpengine; do
-		if ! dpkg-statoverride --list "$DIR" > /dev/null 2>&1; then
-			chown rtpengine:rtpengine "$DIR"
-			chmod 0770 "$DIR"
-		fi
-	done
+	rtpdir='/var/spool/rtpengine'
+	if ! dpkg-statoverride --list "$rtpdir" > /dev/null 2>&1; then
+		chown rtpengine:rtpengine "$rtpdir"
+		chmod 0770 "$rtpdir"
+	fi
 fi
 
 #DEBHELPER#

debian/ngcp-rtpengine-recording-daemon.postinst

@@ -3,12 +3,11 @@
 set -e
 
 if [ "$1" = configure ]; then
-	for DIR in /var/lib/rtpengine-recording; do
-		if ! dpkg-statoverride --list "$DIR" > /dev/null 2>&1; then
-			chown rtpengine:rtpengine "$DIR"
-			chmod 0770 "$DIR"
-		fi
-	done
+	rtpdir='/var/lib/rtpengine-recording'
+	if ! dpkg-statoverride --list "$rtpdir" > /dev/null 2>&1; then
+		chown rtpengine:rtpengine "$rtpdir"
+		chmod 0770 "$rtpdir"
+	fi
 fi
 
 #DEBHELPER#