ALSA: snd-usb: fix sync pipe check
Fix a bogus sanity check for sync pipe in pcm.c. This flaw was introduced during the streaming logic refactorization. While at it, improve the error messages that are generated in such cases. Signed-off-by: NDaniel Mack <zonque@gmail.com> Reported-and-tested-by: <ben@b1c1l1.com> Signed-off-by: NTakashi Iwai <tiwai@suse.de>
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