usb: core: hub.c: Removed some warnings generated by checkpatch.pl

Removed some checkpatch.pl warnings saying there was an unwanted space between
function names and their arguments.

Signed-off-by: Chase Metzger <chasemetzger15@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>