mctp: Remove redundant if statements

The 'if (dev)' statement already move into dev_{put , hold}, so remove
redundant if statements.

Signed-off-by: Xu Wang <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/mctp/route.c

···
 	if (!ext_rt)
 		mctp_route_release(rt);
 
-	if (dev)
-		dev_put(dev);
+	dev_put(dev);
 
 	return rc;