[PATCH] sparc: fix led.c driver when PROC_FS is not enabled

[Randy Dunlap]

Fix Sparc build when CONFIG_PROC_FS is not enabled.

Fixes this build error:
arch/sparc/kernel/led.c:107:30: error: 'led_proc_ops' defined but not used [-Werror=unused-const-variable=]
     107 | static const struct proc_ops led_proc_ops = {
         |                              ^~~~~~~~~~~~
   cc1: all warnings being treated as errors

Fixes: 97a32539b956 ("proc: convert everything to "struct proc_ops"")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Lars Kotthoff <metalhead@xxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: sparclinux@xxxxxxxxxxxxxxx
---
This driver is mostly useless without CONFIG_PROC_FS.
I think it would be just as satisfactory to make it depend on
PROC_FS.  Eh?

 arch/sparc/kernel/led.c |    2 ++
 1 file changed, 2 insertions(+)

--- linux-next-20201116.orig/arch/sparc/kernel/led.c
+++ linux-next-20201116/arch/sparc/kernel/led.c
@@ -50,6 +50,7 @@ static void led_blink(struct timer_list
 	add_timer(&led_blink_timer);
 }
 
+#ifdef CONFIG_PROC_FS
 static int led_proc_show(struct seq_file *m, void *v)
 {
 	if (get_auxio() & AUXIO_LED)
@@ -111,6 +112,7 @@ static const struct proc_ops led_proc_op
 	.proc_release	= single_release,
 	.proc_write	= led_proc_write,
 };
+#endif
 
 static struct proc_dir_entry *led;