net: phy: micrel: Fix regression in kszphy_probe

net: phy: micrel: Fix regression in kszphy_probe

Don't do clock-mode-select if clk == NULL,
since when building without CONFIG_HAVE_CLK,
clk_get returns NULL and clk_get_rate returns 0.

Doing clock-mode-select in this cause causes kszphy_probe to
return -EINVAL and thus prevents the device from being probed.

The original code (before regression) would return 0
when building without CONFIG_HAVE_CLK.

Cc: stable <[email protected]> # 3.18+
Fixes: 1fadee0c3645 ("net/phy: micrel: Add clock support for
KSZ8021/KSZ8031")
Reviewed-by: Fabio Estevam <[email protected]>
Reviewed-by: Johan Hovold <[email protected]>
Signed-off-by: Niklas Cassel <[email protected]>
Signed-off-by: David S. Miller <[email protected]>