use size_t

Max Kellermann <max@duempel.org>
diff --git a/iptables-restore.c b/iptables-restore.c
index dc82f1d..ade1a2f 100644
--- a/iptables-restore.c
+++ b/iptables-restore.c
@@ -320,7 +320,7 @@
 			/* the parser */
 			char *curchar;
 			int quote_open;
-			int param_len;
+			size_t param_len;
 
 			/* reset the newargv */
 			newargc = 0;