net: phy: mxl-gpy: fix version reporting

[ Upstream commit fc3dd036 ]

The commit 09ce6b20 ("net: phy: mxl-gpy: add temperature sensor")
will overwrite the return value and the reported version will be wrong.
Fix it.

Fixes: 09ce6b20 ("net: phy: mxl-gpy: add temperature sensor")
Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: 5f4d487d ("net: phy: mxl-gpy: add MDINT workaround")
Signed-off-by: Sasha Levin <sashal@kernel.org>