pnpbios: fix warning if CONFIG_HOTPLUG=n

drivers/pnp/pnpbios/core.c: In function 'pnpbios_thread_init':
drivers/pnp/pnpbios/core.c:578: warning: unused variable 'task'
Signed-off-by: NErik Ekman <erik@kryo.se>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/pnp/pnpbios/core.c

@@ -575,8 +575,6 @@ fs_initcall(pnpbios_init);
 
 static int __init pnpbios_thread_init(void)
 {
-	struct task_struct *task;
-
 #if defined(CONFIG_PPC)
 	if (check_legacy_ioport(PNPBIOS_BASE))
 		return 0;
@@ -584,10 +582,13 @@ static int __init pnpbios_thread_init(void)
 	if (pnpbios_disabled)
 		return 0;
 #ifdef CONFIG_HOTPLUG
-	init_completion(&unload_sem);
-	task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd");
-	if (!IS_ERR(task))
-		unloading = 0;
+	{
+		struct task_struct *task;
+		init_completion(&unload_sem);
+		task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd");
+		if (!IS_ERR(task))
+			unloading = 0;
+	}
 #endif
 	return 0;
 }