Ticket #540: Added pjsua-lib feature auto-close sound device on idle and new pjsua option --snd-auto-close=N

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@2018 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjsip/src/pjsua-lib/pjsua_core.c b/pjsip/src/pjsua-lib/pjsua_core.c
index a50ff43..a59e934 100644
--- a/pjsip/src/pjsua-lib/pjsua_core.c
+++ b/pjsip/src/pjsua-lib/pjsua_core.c
@@ -171,6 +171,7 @@
     cfg->ilbc_mode = PJSUA_DEFAULT_ILBC_MODE;
     cfg->ec_tail_len = PJSUA_DEFAULT_EC_TAIL_LEN;
     cfg->jb_init = cfg->jb_min_pre = cfg->jb_max_pre = cfg->jb_max = -1;
+    cfg->snd_auto_close_time = -1;
 
     cfg->turn_conn_type = PJ_TURN_TP_UDP;
 }