cputlb: Tidy memset() of arrays
Don't duplicate the array length computation in the memset() when plain sizeof() can produce the correct results. Signed-off-by: NRichard Henderson <rth@twiddle.net> Reviewed-by: NAurelien Jarno <aurelien@aurel32.net> Signed-off-by: NAndreas Färber <afaerber@suse.de>
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