The poll version of fserve_client_waiting causes icecast to die with an

assertion when it first starts up on OS X, because ufds starts out NULL.
I'd been using the select version until now and never noticed.

svn path=/icecast/trunk/icecast/; revision=8956

src/fserve.c

@@ -142,7 +142,7 @@ int fserve_client_waiting (void)
             i++;
         }
     }
-    if (poll(ufds, fserve_clients, 200) > 0)
+    if (ufds && poll(ufds, fserve_clients, 200) > 0)
     {
         /* mark any clients that are ready */
         fclient = active_list;