drivers: net: xgene: Check for IS_ERR rather than NULL for clock.
This patches fixes the code to check for IS_ERR rather than NULL for clock interface. Signed-off-by: NIyappan Subramanian <isubramanian@apm.com> Signed-off-by: NSuman Tripathi <stripathi@apm.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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