usb: ether: avoid NULL check before free()

free() checks if its argument is NULL. Do not duplicate this check.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/drivers/usb/gadget/ether.c b/drivers/usb/gadget/ether.c
index a118283..8533abf 100644
--- a/drivers/usb/gadget/ether.c
+++ b/drivers/usb/gadget/ether.c
@@ -2472,8 +2472,7 @@
 		}
 		usb_gadget_handle_interrupts(0);
 	}
-	if (rndis_pkt)
-		free(rndis_pkt);
+	free(rndis_pkt);
 
 	return 0;
 drop: