[ALSA] usbaudio.c: remove #ifndef CONFIG_USB_EHCI_SPLIT_ISO code

Since USB_EHCI_SPLIT_ISO is now unconditionally enabled the
#ifndef CONFIG_USB_EHCI_SPLIT_ISO became wrong.

Reported-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index 410be4a..b8cfb7c 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -819,10 +819,6 @@
 		return "device disabled";
 	case -EHOSTUNREACH:
 		return "device suspended";
-#ifndef CONFIG_USB_EHCI_SPLIT_ISO
-	case -ENOSYS:
-		return "enable CONFIG_USB_EHCI_SPLIT_ISO to play through a hub";
-#endif
 	case -EINVAL:
 	case -EAGAIN:
 	case -EFBIG: