Move where fdno is set to the default value to *after* the read callback of the channel driver is called.

We have to do this as the underlying channel driver may need the fdno value to determine what to read.


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@179671 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/channel.c

@@ -2061,12 +2061,6 @@ static struct ast_frame *__ast_read(struct ast_channel *chan, int dropaudio)
 	}
 	prestate = chan->_state;
 
-	/* 
-	 * Reset the recorded file descriptor that triggered this read so that we can
-	 * easily detect when ast_read() is called without properly using ast_waitfor().
-	 */
-	chan->fdno = -1;
-
 	/* Read and ignore anything on the alertpipe, but read only
 	   one sizeof(blah) per frame that we send from it */
 	if (chan->alertpipe[0] > -1) {
@@ -2191,6 +2185,12 @@ static struct ast_frame *__ast_read(struct ast_channel *chan, int dropaudio)
 			ast_log(LOG_WARNING, "No read routine on channel %s\n", chan->name);
 	}
 
+        /*
+	 * Reset the recorded file descriptor that triggered this read so that we can
+	 * easily detect when ast_read() is called without properly using ast_waitfor().
+	 */
+	chan->fdno = -1;
+
 	if (f) {
 		/* if the channel driver returned more than one frame, stuff the excess
 		   into the readq for the next ast_read call (note that we can safely assume