usb: Turn some printf into pr_*
So that these messages can be suppressed if necessary.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
1 parent 4a22305 commit 61d6a8485db04bdf6eeed187e9790c9a7f38e848
@Sascha Hauer Sascha Hauer authored on 24 Sep 2013
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drivers/usb/core/usb.c