net: phy: sfp: Fix kernel doc warning

We forgot to update the kernel doc header above sfp_register_upstream()

Fixes: c19bb000 ("sfp: convert to fwnode")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/sfp-bus.c

@@ -441,7 +441,7 @@ EXPORT_SYMBOL_GPL(sfp_upstream_stop);
 
 /**
  * sfp_register_upstream() - Register the neighbouring device
- * @np: device node for the SFP bus
+ * @fwnode: firmware node for the SFP bus
  * @ndev: network device associated with the interface
  * @upstream: the upstream private data
  * @ops: the upstream's &struct sfp_upstream_ops