sh_eth: check TSU registers ioremap() error
One must check the result of ioremap() -- in this case it prevents potential kernel oops when initializing TSU registers further on... Signed-off-by: NSergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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