The string should be "tx_disable" to match the state enum.

Fixes: 4005a7cb ("net: phy: sftp: print debug message with text, not numbers")
Signed-off-by: NSean Anderson <sean.anderson@seco.com>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>