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When eisa_driver_register() or tc_register_driver() failed,
the modprobe defxx would fail with some err log as follows:
Error: Driver 'defxx' is already registered, aborting...
Fix this issue by adding err hanling in dfx_init().
Fixes: e89a2cfb7d ("[TC] defxx: TURBOchannel support")
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>