The brcms_c_attach_malloc() function can call this with a NULL
"wlc->corestate" or "wlc->hw".

Also I threw in a bonus cleanup by deleting an obvious comment and a
no-op NULL assignment.  :)

Signed-off-by: Dan Carpenter <[email protected]>

diff --git a/drivers/net/wireless/brcm80211/brcmsmac/main.c 
b/drivers/net/wireless/brcm80211/brcmsmac/main.c
index 738cfac..a104d7a 100644
--- a/drivers/net/wireless/brcm80211/brcmsmac/main.c
+++ b/drivers/net/wireless/brcm80211/brcmsmac/main.c
@@ -445,18 +445,18 @@ static void brcms_c_detach_mfree(struct brcms_c_info *wlc)
        kfree(wlc->protection);
        kfree(wlc->stf);
        kfree(wlc->bandstate[0]);
-       kfree(wlc->corestate->macstat_snapshot);
+       if (wlc->corestate)
+               kfree(wlc->corestate->macstat_snapshot);
        kfree(wlc->corestate);
-       kfree(wlc->hw->bandstate[0]);
+       if (wlc->hw)
+               kfree(wlc->hw->bandstate[0]);
        kfree(wlc->hw);
        if (wlc->beacon)
                dev_kfree_skb_any(wlc->beacon);
        if (wlc->probe_resp)
                dev_kfree_skb_any(wlc->probe_resp);
 
-       /* free the wlc */
        kfree(wlc);
-       wlc = NULL;
 }
 
 static struct brcms_bss_cfg *brcms_c_bsscfg_malloc(uint unit)
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