Fix compilation error on certain versions of GCC.

........

Merged revisions 421447 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@421448 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_stasis.c

@@ -1336,9 +1336,10 @@ int stasis_app_exec(struct ast_channel *chan, const char *app_name, int argc,
 	control = NULL;
 
 	if (!ast_check_hangup_locked(chan) && !ast_channel_pbx(chan)) {
-		struct ast_pbx_args pbx_args = {
-			.no_hangup_chan = 1,
-		};
+		struct ast_pbx_args pbx_args;
+
+		memset(&pbx_args, 0, sizeof(pbx_args));
+		pbx_args.no_hangup_chan = 1;
 
 		res = ast_pbx_run_args(chan, &pbx_args);
 	}