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Instead of opencoding them use the standard roundup_pow_of_two() and rounddown_pow_of_two() helper functions. This gets rids one of the few users of the custom ld2() function and also makes it a bit more obvious what the code does. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>