sched.c: Call debug_show_all_locks() when dumping all tasks

In commit v2.6.21-691-g39bc89f ("make SysRq-T show all tasks
again") the interface of show_state_filter() was changed: zero
valued 'state_filter' specifies "dump all tasks" (instead of -1).

However, the condition for calling debug_show_all_locks() ("show
locks if all tasks are dumped") was not updated accordingly.

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Cc: peterz@infradead.org
LKML-Reference: <4b0d2fe4.0ab6660a.6437.3cfc@mx.google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/sched.c b/kernel/sched.c
index 010d5e1..a57c6ae 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -6915,7 +6915,7 @@
 	/*
 	 * Only show locks if all tasks are dumped:
 	 */
-	if (state_filter == -1)
+	if (!state_filter)
 		debug_show_all_locks();
 }