pstore/ram: (really) fix undefined usage of rounddown_pow_of_two
Previous attempt to fix was b042e474 Suggested use of is_power_of_2() was bogus because is_power_of_2(0) is false (documented behaviour). Signed-off-by: NMaxime Bizon <mbizon@freebox.fr> Acked-by: NKees Cook <keescook@chromium.org> Signed-off-by: NTony Luck <tony.luck@intel.com>
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