smsc95xx: check return value of smsc95xx_reset

The return value of the function smsc95xx_reset() must be checked
to avoid returning false success from the function smsc95xx_bind().

Fixes: 2f7ca802 ("net: Add SMSC LAN9500 USB2.0 10/100 ethernet adapter driver")
Signed-off-by: Andre Edich <andre.edich@microchip.com>
Signed-off-by: Parthiban Veerasooran <Parthiban.Veerasooran@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>