When CONFIG_PROC_FS isn't set, gcc warning this:

drivers/acpi/button.c:255:12: warning: ‘acpi_button_state_seq_show’ defined but 
not used [-Wunused-function]
 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
            ^
fix this by adding #ifdef around it.

Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
 drivers/acpi/button.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index 2345a5e..8538e25 100644
--- a/drivers/acpi/button.c
+++ b/drivers/acpi/button.c
@@ -252,6 +252,7 @@ static int acpi_lid_notify_state(struct acpi_device 
*device, int state)
        return ret;
 }
 
+#ifdef CONFIG_PROC_FS
 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
 {
        struct acpi_device *device = seq->private;
@@ -262,6 +263,7 @@ static int acpi_button_state_seq_show(struct seq_file *seq, 
void *offset)
                   state < 0 ? "unsupported" : (state ? "open" : "closed"));
        return 0;
 }
+#endif
 
 static int acpi_button_add_fs(struct acpi_device *device)
 {
-- 
2.7.0


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