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net: ibm: emac: Fix some error handling path in 'emac_probe()'
If 'irq_of_parse_and_map()' or 'of_address_to_resource()' fail, 'err' is
known to be 0 at this point.
So return -ENODEV instead in the first case and use 'of_iomap()' instead of
the equivalent 'of_address_to_resource()/ioremap()' combinaison in the 2nd
case.
Doing so, the 'rsrc_regs' field of the 'emac_instance struct' becomes
redundant and is removed.
While at it, turn a 'err != 0' test into an equivalent 'err' to be more
consistent.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>