When using the read cache in bread(), ensure that the current (sub)block

isn't past the end of the file system.

Should fix the "spins forever but doing nothing" bug that dump
would occasionally have.

sbin/dump/rcache.c

@@ -1,4 +1,4 @@
-/*	$NetBSD: rcache.c,v 1.8 2001/12/22 08:05:25 lukem Exp $	*/
+/*	$NetBSD: rcache.c,v 1.9 2001/12/22 08:45:36 lukem Exp $	*/
 
 /*-
  * Copyright (c) 1999 The NetBSD Foundation, Inc.
@@ -265,7 +265,6 @@ bread(daddr_t blkno, char *buf, int size)
 		return;
 	}
 
-
 retry:
 	while(size > 0) {
 		int	i;
@@ -345,12 +344,12 @@ retry:
 		/* No more to do? */
 		if (size == 0)
 			break;
-			
+
 		/*
 		 * This does actually not happen if fs blocks are not greater
 		 * than nblksread.
 		 */
-		if (numBlocks > nblksread) {
+		if (numBlocks > nblksread || blkno >= ufsib->ufs_dsize) {
 			rawread(oblkno, obuf, osize);
 			break;
 		} else {