From e1d10bba7eeac3f4bb99a8f3a164d222ec7f609e Mon Sep 17 00:00:00 2001
From: Charles Kerr <charles@transmissionbt.com>
Date: Thu, 13 Dec 2007 02:48:30 +0000
Subject: [PATCH] add extra debugging messages for upnpDiscover()

---
 libtransmission/upnp.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/libtransmission/upnp.c b/libtransmission/upnp.c
index 0263054ff..11dd5a7ee 100644
--- a/libtransmission/upnp.c
+++ b/libtransmission/upnp.c
@@ -88,7 +88,12 @@ tr_upnpPulse( tr_upnp * handle, int port, int isEnabled )
 
     if( handle->state == TR_UPNP_DISCOVER )
     {
-        struct UPNPDev * devlist = upnpDiscover( 2000, NULL );
+        struct UPNPDev * devlist;
+        errno = 0;
+        devlist = upnpDiscover( 2000, NULL );
+        if( devlist == NULL ) {
+            tr_err( KEY "upnpDiscover returned NULL (errno %d - %s)", errno, strerror(errno) );
+        }
         errno = 0;
         if( UPNP_GetValidIGD( devlist, &handle->urls, &handle->data, handle->lanaddr, sizeof(handle->lanaddr))) {
             tr_inf( KEY "found Internet Gateway Device '%s'", handle->urls.controlURL );