minor shellcheck fixes after applying latest patches

scripts/core/sxmo_lock.sh

@@ -5,7 +5,7 @@
 . "$(dirname "$0")/sxmo_common.sh"
 
 finish() {
-	kill $LOCKPID
+	kill "$LOCKPID"
 }
 trap 'finish' TERM INT
 

scripts/core/sxmo_proximitylock.sh

@@ -9,7 +9,7 @@ syncstate() {
 }
 
 finish() {
-	kill $(jobs -p)
+	kill "$(jobs -p)"
 	syncstate
 	[ free = "$STATE" ] && [ true = "$WASLOCKED" ] && sxmo_lock.sh &
 	exit 0

scripts/modem/sxmo_modemcall.sh

@@ -25,14 +25,14 @@ finish() {
 		echo "sxmo_modemcall: $1">&2
 		notify-send "$1"
 	fi
-	[ -n "$LOCKPID" ] && kill $LOCKPID
+	[ -n "$LOCKPID" ] && kill "$LOCKPID"
 	pkill -9 dmenu
 	exit 1
 }
 
 gracefulexit() {
-	kill $MAINPID
-	wait $MAINPID
+	kill "$MAINPID"
+	wait "$MAINPID"
 	finish "Call ended"
 }