Input: drivers/usb/input - usb_buffer_free() cleanup

usb_buffer_free() now handles NULLs so remove unneeded checks
form callers.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/usb/input/powermate.c b/drivers/usb/input/powermate.c
index 4f93a76..448a470 100644
--- a/drivers/usb/input/powermate.c
+++ b/drivers/usb/input/powermate.c
@@ -291,12 +291,10 @@
 
 static void powermate_free_buffers(struct usb_device *udev, struct powermate_device *pm)
 {
-	if (pm->data)
-		usb_buffer_free(udev, POWERMATE_PAYLOAD_SIZE_MAX,
-				pm->data, pm->data_dma);
-	if (pm->configcr)
-		usb_buffer_free(udev, sizeof(*(pm->configcr)),
-				pm->configcr, pm->configcr_dma);
+	usb_buffer_free(udev, POWERMATE_PAYLOAD_SIZE_MAX,
+			pm->data, pm->data_dma);
+	usb_buffer_free(udev, sizeof(*(pm->configcr)),
+			pm->configcr, pm->configcr_dma);
 }
 
 /* Called whenever a USB device matching one in our supported devices table is connected */