staging: ozwpan: oz_pd_free() can be static

Cc: Rupesh Gujare <rupesh.gujare@atmel.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/ozwpan/ozpd.c b/drivers/staging/ozwpan/ozpd.c
index e1757aa..ab85a72 100644
--- a/drivers/staging/ozwpan/ozpd.c
+++ b/drivers/staging/ozwpan/ozpd.c
@@ -200,7 +200,7 @@
 /*
  * Context: softirq or process
  */
-void oz_pd_free(struct work_struct *work)
+static void oz_pd_free(struct work_struct *work)
 {
 	struct list_head *e;
 	struct oz_tx_frame *f;