remove min session heartbeat

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@10652 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_core_session.c

@@ -896,7 +896,7 @@ SWITCH_DECLARE(void) switch_core_session_enable_heartbeat(switch_core_session_t
 {
 	switch_assert(session != NULL);
 
-	if (seconds < 10) {
+	if (!seconds) {
 		seconds = 60;
 	}