Fix a couple of shellcheck issues.

Change-Id: Iaebbe5227ffcc581e794a3be1f8b9020fd600f68
Reviewed-on: https://code.wireshark.org/review/33739
Reviewed-by: Gerald Combs <gerald@wireshark.org>

image/stock_icons/svg-to-png.sh

@@ -13,7 +13,7 @@
 
 COMMON_ARGS="--export-area-page"
 
-SVGCLEANER=$( type -p svgcleaner )
+#SVGCLEANER=$( type -p svgcleaner )
 
 set_source_svgs() {
     local out_icon=$1

packaging/macosx/osx-app.sh.in

@@ -372,7 +372,7 @@ rpathify_dir () {
 		#
 		# shellcheck disable=SC2086
 		files=$( ls $2 2>/dev/null )
-		if [ ! -z "$files" ]; then
+		if [ -n "$files" ]; then
 			for file in $files; do
 				rpathify_file "$file" "$( pwd )"
 			done