Staging: speakup: fix checkpatch warning

This fixes the following checkpatch.pl warning:
WARNING: Missing a blank line after declarations
Signed-off-by: Nicoleta Birsan <nicolle.birsan@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/speakup/thread.c

@@ -21,6 +21,7 @@ int speakup_thread(void *data)
 	mutex_lock(&spk_mutex);
 	while (1) {
 		DEFINE_WAIT(wait);
+
 		while (1) {
 			spin_lock_irqsave(&speakup_info.spinlock, flags);
 			our_sound = spk_unprocessed_sound;