[PATCH] usb: kfree() cleanups in drivers/usb/core/devio.c

Checking for NULL before calling kfree() is redundant. This patch removes
these redundant checks and also makes a few tiny whitespace changes.

Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>