r8169,sis190: remove unnecessary length check
The ethtool core will lower the requested length to the one returned by get_regs_len, therefore no additional check is needed in the get_regs function. Reported-by: NBen Hutchings <bhutchings@solarflare.com> Signed-off-by: NPeter Wu <lekensteyn@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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