Staging: w35und: purb typedef removal

This patch removes the struct urb pointer typedef from the driver code and
fixes up variable names that use the typedef while we're at it.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>