xen: replace ffsl with ctzl
ffsl is a GNU extension and not available in musl libc. See also commit fbeadf50 (bitops: unify bitops_ffsl with the one in host-utils.h, call it bitops_ctzl) on why ctzl should be used instead of ffsl. Signed-off-by: NNatanael Copa <ncopa@alpinelinux.org> Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com> [PMM: rebased to accommodate file rename to xen-hvm.c] Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
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