Empty vendor string overrides knowndevs
Empty vendor string overrides knowndevs

ubd_devinfo_vp() is getting an empty string from its  usbd_get_string()
call on the vendor, instead of NULL.  This means usb_knowndevs in not
consulted.

Add lines between grabbing those char *s and the USBVERBOSE ifdef to
set vendor to NULL if it is the empty string (similarly for product).

This causes vendor to be filled-out, although the product name read
overrules usb_knowndevs (this appears to be a conscience decision made
by the NetBSD folks):

PR:		kern/56097
Submitted by:	Hal Burch <hburch@lumeta.com>
MFC after:	1 week

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