drivers/net/at91_emac.c: change return values
Some return values pretended correct pass. This patch changes them according to README.drivers.net. This patch changes e.g. command 'dhcp' to stop after errorneous autonegotiation. Signed-off-by: NAndreas Bießmann <andreas.devel@googlemail.com> Signed-off-by: NBen Warren <biggerbadderben@gmail.com>
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