ALSA: usb-audio: Suppress repetitive debug messages from retire_playback_urb()
ALSA: usb-audio: Suppress repetitive debug messages from retire_playback_urb()

BugLink: http://bugs.launchpad.net/bugs/1305133

Malfunctioning or slow devices can cause a flood of dmesg SPAM.

I've ignored checkpatch.pl complaints about the use of printk_ratelimit() in favour
of prior art in sound/usb/pcm.c.

WARNING: Prefer printk_ratelimited or pr_<level>_ratelimited to printk_ratelimit
+	if (printk_ratelimit() &&

Cc: Jaroslav Kysela <72edd5e1a572f82f059ccbb83c92b74d6cb051ff@perex.cz>
Cc: Takashi Iwai <4596b3305151c7ee743192a95d394341e3d3b644@suse.de>
Cc: Eldad Zack <46870ccd9486ced5844a21b823ddb0e89874ecb6@fogrefinery.com>
Cc: Daniel Mack <70806a71956ed8873ecff8522779dae1401a1b4a@gmail.com>
Cc: Clemens Ladisch <9f57ef5ff1095f40b1ee8b7caa363908baef59d7@ladisch.de>
Signed-off-by: Tim Gardner <c65a040f7f664378353fb65fc3553df208a14f68@canonical.com>
Signed-off-by: Takashi Iwai <4596b3305151c7ee743192a95d394341e3d3b644@suse.de>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs