staging: ozwpan: Remove redundant null check before kfree in ozproto.c

kfree on NULL pointer is a no-op.
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NRupesh Gujare <rgujare@ozmodevices.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/ozwpan/ozproto.c

@@ -566,8 +566,7 @@ static void oz_protocol_timer(unsigned long arg)
 		}
 		spin_unlock_bh(&g_polling_lock);
 		oz_pd_put(pd);
-		if (t)
-			kfree(t);
+		kfree(t);
 		t = t2;
 	} while (t);
 	g_timer_state = OZ_TIMER_IDLE;