Input: prepare for f_ops constness

Avoid doing assignments to a live ->fops so it can be marked as 'const'.
Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/input.c

@@ -477,8 +477,8 @@ static int __init input_proc_init(void)
 
 	entry->owner = THIS_MODULE;
 	input_fileops = *entry->proc_fops;
+	input_fileops.poll = input_devices_poll;
 	entry->proc_fops = &input_fileops;
-	entry->proc_fops->poll = input_devices_poll;
 
 	entry = create_proc_read_entry("handlers", 0, proc_bus_input_dir, input_handlers_read, NULL);
 	if (!entry)