fix comnment/printk typos concerning "empty"

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 4568298..3634ced 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -636,7 +636,7 @@
 		min_datainterval = min(min_datainterval, fp->datainterval);
 	}
 	if (min_datainterval == 0xff) {
-		hwc_debug("  --> get emtpy\n");
+		hwc_debug("  --> get empty\n");
 		it->empty = 1;
 		return -EINVAL;
 	}