Fix an issue where Local channels dialed by app_queue are considered in use immediately.

The chan_local channel driver returns a device state of in use even if a created Local
channel has not yet been dialed. This fix changes the logic to return a state of not
in use until the channel itself has been dialed.

(closes issue ASTERISK-20390)
Reported by: tim_ringenbach

Review: https://reviewboard.asterisk.org/r/2116/
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Merged revisions 373878 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 373879 from http://svn.asterisk.org/svn/asterisk/branches/10
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Merged revisions 373880 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@373881 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_local.c

@@ -311,11 +311,13 @@ static int local_devicestate(const char *data)
 	res = AST_DEVICE_NOT_INUSE;
 
 	it = ao2_iterator_init(locals, 0);
-	while ((lp = ao2_iterator_next(&it))) {
+	while ((lp = ao2_iterator_next(&it)) && (res == AST_DEVICE_NOT_INUSE)) {
 		if (!strcmp(exten, lp->exten) && !strcmp(context, lp->context) && lp->owner) {
-			res = AST_DEVICE_INUSE;
-			ao2_ref(lp, -1);
-			break;
+			ao2_lock(lp);
+			if (ast_test_flag(lp, LOCAL_LAUNCHED_PBX)) {
+				res = AST_DEVICE_INUSE;
+			}
+			ao2_unlock(lp);
 		}
 		ao2_ref(lp, -1);
 	}