Fix build warnings like these when CONFIG_PS3_FLASH=n:

  arch/powerpc/platforms/ps3/os-area.c: warning: 'update_flash_db' defined but not used

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
---
 arch/powerpc/platforms/ps3/os-area.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/powerpc/platforms/ps3/os-area.c
+++ b/arch/powerpc/platforms/ps3/os-area.c
@@ -578,7 +578,7 @@ static void os_area_db_init(struct os_ar
  *
  */
 
-static void update_flash_db(void)
+static void __maybe_unused update_flash_db(void)
 {
 	int result;
 	int file;

--