WL_CHANSPEC_CTL_SB_NONE
if (CHSPEC_CTL_SB(chspec) == WL_CHANSPEC_CTL_SB_NONE)
(((chspec) & WL_CHANSPEC_CTL_SB_MASK) == WL_CHANSPEC_CTL_SB_NONE)
WL_CHANSPEC_CTL_SB_NONE | rc);