shairport-sync: fix init script

'name' may contains '%h' or '%v', printf will fail on that

Signed-off-by: Liangbin Lian <jjm2473@gmail.com>

sound/shairport-sync/Makefile

@@ -8,7 +8,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=shairport-sync
 PKG_VERSION:=3.3.9
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://codeload.github.com/mikebrady/shairport-sync/tar.gz/$(PKG_VERSION)?

sound/shairport-sync/files/shairport-sync.init

@@ -26,7 +26,7 @@ append_str() {
 
 	config_get val "$cfg" "$var"
 	if [ -n "$val" ] || [ -n "$def" ]; then
-		printf "\t%s = \"${val:-$def}\";\n" "$opt"
+		printf "\t%s = \"%s\";\n" "$opt" "${val:-$def}"
 	fi
 }