[PATCH] fix copy_process() error check

The return value of copy_process() should be checked by IS_ERR().
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

kernel/fork.c

@@ -1315,9 +1315,8 @@ struct task_struct * __devinit fork_idle(int cpu)
 	struct pt_regs regs;
 
 	task = copy_process(CLONE_VM, 0, idle_regs(&regs), 0, NULL, NULL, 0);
-	if (!task)
-		return ERR_PTR(-ENOMEM);
-	init_idle(task, cpu);
+	if (!IS_ERR(task))
+		init_idle(task, cpu);
 
 	return task;
 }