ip[6]tables: show --protocol instead of --proto in usage

As the man page shows --protocol not --proto, also do so in the usage
text displayed by ip[6]tables -h.

Signed-off-by: Mart Frauenlob <mart.frauenlob@chello.at>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
diff --git a/iptables/ip6tables.c b/iptables/ip6tables.c
index 7d02cc1..c8d34e2 100644
--- a/iptables/ip6tables.c
+++ b/iptables/ip6tables.c
@@ -237,7 +237,7 @@
 "Options:\n"
 "    --ipv4	-4		Error (line is ignored by ip6tables-restore)\n"
 "    --ipv6	-6		Nothing (line is ignored by iptables-restore)\n"
-"[!] --proto	-p proto	protocol: by number or name, eg. `tcp'\n"
+"[!] --protocol	-p proto	protocol: by number or name, eg. `tcp'\n"
 "[!] --source	-s address[/mask][,...]\n"
 "				source specification\n"
 "[!] --destination -d address[/mask][,...]\n"
diff --git a/iptables/iptables.c b/iptables/iptables.c
index 085eea1..79fa37b 100644
--- a/iptables/iptables.c
+++ b/iptables/iptables.c
@@ -231,7 +231,7 @@
 "Options:\n"
 "    --ipv4	-4		Nothing (line is ignored by ip6tables-restore)\n"
 "    --ipv6	-6		Error (line is ignored by iptables-restore)\n"
-"[!] --proto	-p proto	protocol: by number or name, eg. `tcp'\n"
+"[!] --protocol	-p proto	protocol: by number or name, eg. `tcp'\n"
 "[!] --source	-s address[/mask][...]\n"
 "				source specification\n"
 "[!] --destination -d address[/mask][...]\n"