FreeSWITCH: Fix format string error in witch_core_session_thread_pool_worker().

Fixes:
    cc1: warnings being treated as errors
    src/switch_core_session.c: In function 'switch_core_session_thread_pool_worker':
    src/switch_core_session.c:1478: warning: format '%ld' expects type 'long int', but argument 9 has type 'switch_size_t'
    src/switch_core_session.c:1483: warning: format '%ld' expects type 'long int', but argument 9 has type 'switch_size_t'
    gmake[2]: *** [libfreeswitch_la-switch_core_session.lo] Error 1
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

src/switch_core_session.c

@@ -1474,12 +1474,12 @@ static void *SWITCH_THREAD_FUNC switch_core_session_thread_pool_worker(switch_th
 			session_manager.busy++;
 			switch_mutex_unlock(session_manager.mutex);
 			
-			switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG10, "Worker Thread %ld Processing session %ld %s\n", 
+			switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG10, "Worker Thread %ld Processing session %"SWITCH_SIZE_T_FMT" %s\n",
 							  (long) thread, session->id, switch_core_session_get_name(session));
 
 			switch_core_session_thread(thread, (void *) session);
 
-			switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG10, "Worker Thread %ld Done Processing session %ld %s\n", 
+			switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG10, "Worker Thread %ld Done Processing session %"SWITCH_SIZE_T_FMT" %s\n",
 							  (long) thread, session->id, switch_core_session_get_name(session));
 
 			switch_mutex_lock(session_manager.mutex);