[vala] libesmtp bindings: Fix sentinel in smtp_set_header

[Adrien Bustany <abustany src gnome org>]

commit fe08b45c03ca933db680b61e2ddea77d3b8bc4b8
Author: Adrien Bustany <abustany gnome org>
Date:   Sun Apr 18 21:51:28 2010 -0400

    libesmtp bindings: Fix sentinel in smtp_set_header

 vapi/libesmtp.vapi |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/vapi/libesmtp.vapi b/vapi/libesmtp.vapi
index bec4d5a..0942d49 100644
--- a/vapi/libesmtp.vapi
+++ b/vapi/libesmtp.vapi
@@ -74,7 +74,7 @@ namespace Smtp {
 		public Smtp.Recipient add_recipient (string mailbox);
 		[CCode (cname="smtp_enumerate_recipients")]
 		public int enumerate_recipients (EnumerateRecipientCb cb);
-		[CCode (cname="smtp_set_header")]
+		[CCode (cname="smtp_set_header", sentinel="")]
 		public int set_header (string header, ...);
 		[CCode (cname="smtp_set_header_option")]
 		public int set_header_option (string header, Smtp.HeaderOption option, ...);