alpha: c_next should increase position index

Signed-off-by: Matt Turner <mattst88@gmail.com>

arch/alpha/kernel/setup.c

@@ -1420,6 +1420,7 @@ c_start(struct seq_file *f, loff_t *pos)
 static void *
 c_next(struct seq_file *f, void *v, loff_t *pos)
 {
+	(*pos)++;
 	return NULL;
 }