ar9170usb: more minor fixes

This patch contains a few more mostly random fixes for the USB front-end.

1. handle irq command response, instead of printing it to the console.

2. remove fixed FIXME.
    (real fix: "ar9170usb: reset device on resume". )

3. some more one-liner.
	- get rid of a useless "return;"
	- add a few branch prediction hints in hot-paths
	etc.

Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ar9170/main.c

@@ -370,8 +370,7 @@ static void ar9170_tx_status_janitor(struct work_struct *work)
 				   msecs_to_jiffies(100));
 }
 
-static void ar9170_handle_command_response(struct ar9170 *ar,
-					   void *buf, u32 len)
+void ar9170_handle_command_response(struct ar9170 *ar, void *buf, u32 len)
 {
 	struct ar9170_cmd_response *cmd = (void *) buf;