If we receive DTMF make sure that the state of the speech structure goes back to being not ready. (issue #LUMENVOX-8)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@147517 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_speech_utils.c

@@ -774,6 +774,7 @@ static int speech_background(struct ast_channel *chan, void *data)
 			speech->results->text = strdup(dtmf);
 			speech->results->grammar = strdup("dtmf");
 		}
+		ast_speech_change_state(speech, AST_SPEECH_STATE_NOT_READY);
 	}
 
         /* See if it was because they hung up */