Zero out a declared structure so as to not crash if it contains invalid data (reported by Qwell on #asterisk-dev)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@34400 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_iax2.c

@@ -9335,6 +9335,7 @@ static int iax2_devicestate(void *data)
 	struct iax2_peer *p;
 	int res = AST_DEVICE_INVALID;
 
+	memset(&pds, 0, sizeof(pds));
 	parse_dial_string(tmp, &pds);
 	if (!pds.peer || ast_strlen_zero(pds.peer))
 		return res;