USB: remove redundant "#if"

This patch removes a redundant nested "#ifdef CONFIG_PM" from the hub
driver.  It also adds a label to the "#endif" line corresponding to
the outer "#ifdef CONFIG_PM".

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>