MIPS: Lasat: Replace del_timer by del_timer_sync

Use del_timer_sync to ensure that the timer is stopped on all CPUs before
the driver exists.

This change was suggested by Thomas Gleixner

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r@
declarer name module_exit;
identifier ex;
@@

module_exit(ex);

@@
identifier r.ex;
@@

ex(...) {
  <...
- del_timer
+ del_timer_sync
    (...)
  ...>
}
// </smpl>
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Cc: kernel-janitors@vger.kernel.org
Cc: tglx@linutronix.de
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/6663/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/lasat/picvue_proc.c

@@ -175,7 +175,7 @@ static void pvc_proc_cleanup(void)
 	remove_proc_entry("scroll", pvc_display_dir);
 	remove_proc_entry(DISPLAY_DIR_NAME, NULL);
 
-	del_timer(&timer);
+	del_timer_sync(&timer);
 }
 
 static int __init pvc_proc_init(void)