staging: rtl8192u: fix bitshift calculation in r819xU_phy.c
This patch uses the ffs linux built-in routine in the computation of the bitshift to take advantage of architecture specific instructions that implement this computation more efficiently. Signed-off-by: NXenia Ragiadakou <burzalodowa@gmail.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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