Follow common practice and retire printk(KERN_ERR ...) in favor of
dev_err().

Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: usb-storage@lists.one-eyed-alien.net
Signed-off-by: Matthias Maennich <maennich@google.com>
Link: https://lore.kernel.org/r/20191002110312.75749-1-maennich@google.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>