net: korina: handle clk prepare error in korina_probe()

net: korina: handle clk prepare error in korina_probe()

in korina_probe(), the return value of clk_prepare_enable()
should be checked since it might fail. we can use
devm_clk_get_optional_enabled() instead of devm_clk_get_optional()
and clk_prepare_enable() to automatically handle the error.

Fixes: e4cd854ec487 ("net: korina: Get mdio input clock via common clock framework")
Signed-off-by: Yuanjun Gong <ruc_gongyuanjun@163.com>
Link: https://lore.kernel.org/r/20230731090535.21416-1-ruc_gongyuanjun@163.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>