NTB: ntb_transport: remove redundant assignment to rc

Variable rc is initialized to a value that is never read and it
is re-assigned later. The initialization is redundant and can be
removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>

drivers/ntb/ntb_transport.c

@@ -292,7 +292,7 @@ static int ntb_transport_bus_match(struct device *dev,
 static int ntb_transport_bus_probe(struct device *dev)
 {
 	const struct ntb_transport_client *client;
-	int rc = -EINVAL;
+	int rc;
 
 	get_device(dev);