net:dev: remove double indentical assignment in dev_change_net_namespace().

This patch removes double assignment of err to -EINVAL in dev_change_net_namespace().
Signed-off-by: NRami Rosen <ramirose@gmail.com>
Acked-by: NSerge E. Hallyn <serge.hallyn@ubuntu.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/core/dev.c

@@ -6264,7 +6264,6 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char
 		goto out;
 
 	/* Ensure the device has been registrered */
-	err = -EINVAL;
 	if (dev->reg_state != NETREG_REGISTERED)
 		goto out;