procd: fix procd_lock() when prepare_roofs

This fixes the following errors when doing "make package/install"

    /home/yousong/git-repo/lede-project/lede/build_dir/target-mips_24kc_musl/root-malta/lib/functions/procd.sh: line 47: /home/yousong/git-repo/l
    ede-project/lede/build_dir/target-mips_24kc_musl/root-malta/var/lock/procd_urandom_seed.lock: No such file or directory
    flock: 1000: Bad file descriptor

Fixes FS#1260

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

package/system/procd/Makefile

@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=procd
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(PROJECT_GIT)/project/procd.git

package/system/procd/files/procd.sh

@@ -33,7 +33,7 @@
 #   Send a signal to a service instance (or all instances)
 #
 
-. $IPKG_INSTROOT/usr/share/libubox/jshn.sh
+. "$IPKG_INSTROOT/usr/share/libubox/jshn.sh"
 
 PROCD_RELOAD_DELAY=1000
 _PROCD_SERVICE=
@@ -44,7 +44,7 @@ procd_lock() {
 
 	flock -n 1000 &> /dev/null
 	if [ "$?" != "0" ]; then
-		exec 1000>/var/lock/procd_${service_name}.lock
+		exec 1000>"$IPKG_INSTROOT/var/lock/procd_${service_name}.lock"
 		flock 1000
 		if [ "$?" != "0" ]; then
 			logger "warning: procd flock for $service_name failed"