mountinfo: make sure the netdev variable is initialized on Linux

This fixes the following regression:

X-Gentoo-Bug: 562668
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=562668

Makefile.inc

@@ -1,3 +1,3 @@
 NAME=		openrc
-VERSION=	0.18
+VERSION=	0.18.1
 PKG=		${NAME}-${VERSION}

sh/openrc-run.sh.in

@@ -221,16 +221,16 @@ done
 # Load our script
 sourcex "$RC_SERVICE"
 
-for _d in $required_dirs; do
+eval "printf '%s\n' $required_dirs" | while read _d; do
-	if [ ! -d $_d ]; then
+	if [ ! -d "$_d" ]; then
 		eerror "$RC_SVCNAME: \`$_d' is not a directory"
 		exit 1
 	fi
 done
 unset _d
 
-for _f in $required_files; do
+eval "printf '%s\n' $required_files" | while read _f; do
-	if [ ! -r $_f ]; then
+	if [ ! -r "$_f" ]; then
 		eerror "$RC_SVCNAME: \`$_f' is not readable"
 		exit 1
 	fi

src/rc/mountinfo.c

@@ -305,6 +305,7 @@ find_mounts(struct args *args)
 
 	buffer = xmalloc(sizeof(char) * PATH_MAX * 3);
 	while (fgets(buffer, PATH_MAX * 3, fp)) {
+		netdev = -1;
 		p = buffer;
 		from = strsep(&p, " ");
 		to = strsep(&p, " ");