* if_proc.c, ipforward_proc.c, rtread_proc.c: Fix fd leaks.

	 [backport candidate]
diff --git a/zebra/ipforward_proc.c b/zebra/ipforward_proc.c
index 443cb1c..f83d88c 100644
--- a/zebra/ipforward_proc.c
+++ b/zebra/ipforward_proc.c
@@ -141,6 +141,7 @@
   fgets (buf, 2, fp);
   sscanf (buf, "%d", &ipforwarding);
 
+  fclose (fp);
   return ipforwarding;
 }