sched.c: Remove unused variable 'relative'

Getting rid of the p->children printout in show_task() left behind an
unused variable.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/kernel/sched.c b/kernel/sched.c
index cdad3b0..b9a6837 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4691,7 +4691,6 @@
 
 static void show_task(struct task_struct *p)
 {
-	struct task_struct *relative;
 	unsigned long free = 0;
 	unsigned state;