ALSA: ua101: replace le16_to_cpu() with usb_endpoint_maxp()

Commit 939f325f ("usb: add usb_endpoint_maxp() macro") and commit
29cc8897 ("USB: use usb_endpoint_maxp() instead of le16_to_cpu()")
introduced a new helper macro.  This trivial patch convert remaining
users found in ua101 driver.
Signed-off-by: Cheah Kok Cheong <thrust73@gmail.com>
Acked-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/misc/ua101.c

@@ -1037,7 +1037,7 @@ static int detect_usb_format(struct ua101 *ua)
 		return -ENXIO;
 	}
 	ua->capture.usb_pipe = usb_rcvisocpipe(ua->dev, usb_endpoint_num(epd));
-	ua->capture.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);
+	ua->capture.max_packet_bytes = usb_endpoint_maxp(epd);
 
 	epd = &ua->intf[INTF_PLAYBACK]->altsetting[1].endpoint[0].desc;
 	if (!usb_endpoint_is_isoc_out(epd)) {
@@ -1045,7 +1045,7 @@ static int detect_usb_format(struct ua101 *ua)
 		return -ENXIO;
 	}
 	ua->playback.usb_pipe = usb_sndisocpipe(ua->dev, usb_endpoint_num(epd));
-	ua->playback.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);
+	ua->playback.max_packet_bytes = usb_endpoint_maxp(epd);
 	return 0;
 }