iproute2: add a missing return statement

Since do_help() has to return an int to fit in the table of commands,
it should actually return an int. This patch lets it do so.

Signed-off-by: Kees van Reeuwijk <reeuwijk@few.vu.nl>
diff --git a/ip/ip.c b/ip/ip.c
index 632d271..c3ff627 100644
--- a/ip/ip.c
+++ b/ip/ip.c
@@ -57,6 +57,7 @@
 static int do_help(int argc, char **argv)
+        return 0;
 static const struct cmd {