This patch fixes the most blatant problems that can happen when an error
is encountered during descriptor parsing.

	The struct device embedded within a struct usb_interface is
initialized as soon as the structure is allocated, so that when
put_device() is called it will contain valid data.

	put_device() is not called for unallocated interfaces.

	The pointers in config->extra are freed when the struct
usb_host_config is freed.

	rawdescriptor pointers are initialized to 0 so that they can be
freed without error.

	Partially parsed configurations are remembered so that they will
be deallocated when the entire struct usb_device is freed.