[PATCH] dummy_hcd: minor fixups

Although this is the first patch in a series of six, it's not closely
related to the others.  This includes a whole bunch of simple cleanups
for the dummy-hcd driver, all of which fall into the following categories:

	Convert explicit container_of() to type-safe inline functions,

	Minimize reliance on global variables.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>