Minor updates for better diagnostics from usbcore:

 - Only print ep0 maxpacket when it's not what we first tried

 - have khubd say when it's looking at a hub

 - When warning about synchronous control or bulk timeouts,
   report the program that triggered the message.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>