net: stmmac: dwmac-meson8b: Fix signedness bug in probe
The "dwmac->phy_mode" is an enum and in this context GCC treats it as an unsigned int so the error handling is never triggered. Fixes: 566e8251 ("net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC") Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com> Reviewed-by: NMartin Blumenstingl <martin.blumenstingl@googlemail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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