lockdep: Replace "Bad BFS generated tree" message with something less cryptic

The message of "Bad BFS generated tree" is a bit confusing.
Replace it with a more sane error message.

Thanks to Peter Zijlstra for helping me come up with a better
message.
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20110421014300.135521252@goodmis.orgSigned-off-by: NIngo Molnar <mingo@elte.hu>

kernel/lockdep.c

@@ -1381,7 +1381,7 @@ print_shortest_lock_dependencies(struct lock_list *leaf,
 		printk("\n");
 
 		if (depth == 0 && (entry != root)) {
-			printk("lockdep:%s bad BFS generated tree\n", __func__);
+			printk("lockdep:%s bad path found in chain graph\n", __func__);
 			break;
 		}