Merge from NetBSD: revs 1.89 and 1.90.

Also, add some 'const's to supress warnings. (Submitted back to NetBSD).

The original logs from NetBSD:

	----------------------------
	revision 1.90
	date: 2001/12/03 01:47:12;  author: augustss;  lines: +4 -4
	Handle vendor/product lookup with a common routine.
	----------------------------
	revision 1.89
	date: 2001/12/02 23:25:25;  author: augustss;  lines: +18 -2
	Add a subroutine to search for a vendor/product pair.
	----------------------------

1 files changed, 16 insertions, 0 deletions

diff --git a/sys/dev/usb/usbdi.c b/sys/dev/usb/usbdi.c
index 20d6a03..c762918 100644
--- a/sys/dev/usb/usbdi.c
+++ b/sys/dev/usb/usbdi.c
@@ -1094,6 +1094,22 @@ usbd_get_endpoint_descriptor(iface, address)
 	return (0);
 }
 
+/*
+ * Search for a vendor/product pair in an array.  The item size is
+ * given as an argument.
+ */
+const struct usb_devno *
+usb_match_device(const struct usb_devno *tbl, u_int nentries, u_int sz,
+		 u_int16_t vendor, u_int16_t product)
+{
+	while (nentries-- > 0) {
+		if (tbl->ud_vendor == vendor && tbl->ud_product == product)
+			return (tbl);
+		tbl = (const struct usb_devno *)((const char *)tbl + sz);
+	}
+	return (NULL);
+}
+
 #if defined(__FreeBSD__)
 int
 usbd_driver_load(module_t mod, int what, void *arg)