The function chandef_to_chanspec() was added by
    brcmfmac: determine chanspec from struct cfg80211_chan_def info
    The struct cfg80211_chan_def contains additional info to derive the
    bandwidth and side-band information of the chanspec. This patch adds
    chandef_to_chanspec() function used in IBSS join and starting AP
    operation.
However, it introduced a sparse warning because the function
is only called from within the source file wl_cfg80211.c.
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Reviewed-by: Daniel (Deognyoun) Kim <dekim@broadcom.com>
Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
        return qdbm;
 }
 
-u16 chandef_to_chanspec(struct brcmu_d11inf *d11inf,
-                       struct cfg80211_chan_def *ch)
+static u16 chandef_to_chanspec(struct brcmu_d11inf *d11inf,
+                              struct cfg80211_chan_def *ch)
 {
        struct brcmu_chan ch_inf;
        s32 primary_offset;