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: Rami Rosen <ramirose@gmail.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/dev.c b/net/core/dev.c
index 09cb3f6..b4978e2 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6264,7 +6264,6 @@
 		goto out;
 
 	/* Ensure the device has been registrered */
-	err = -EINVAL;
 	if (dev->reg_state != NETREG_REGISTERED)
 		goto out;