net: sh_eth: fix a missing check of of_get_phy_mode
BugLink: https://bugs.launchpad.net/bugs/1864773 [ Upstream commit 035a14e7 ] of_get_phy_mode may fail and return a negative error code; the fix checks the return value of of_get_phy_mode and returns NULL of it fails. Fixes: b356e978 ("sh_eth: add device tree support") Signed-off-by: Kangjie Lu <kjlu@umn.edu> Reviewed-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com> Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
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