[patch] brcmfmac: move dereference under check for NULL

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skb_pull() dereferences the skb parameter.

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

diff --git a/drivers/net/wireless/brcm80211/brcmfmac/fwsignal.c b/drivers/net/wireless/brcm80211/brcmfmac/fwsignal.c
index ea37bd4..c35296f 100644
--- a/drivers/net/wireless/brcm80211/brcmfmac/fwsignal.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/fwsignal.c
@@ -861,9 +861,9 @@ static bool brcmf_fws_tim_update(struct brcmf_fws_info *fws,
 		      BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP_LEN + 2 +
 		      4 + fws->drvr->hdrlen;
 		skb = brcmu_pkt_buf_get_skb(len);
-		skb_pull(skb, len);
 		if (skb == NULL)
 			return false;
+		skb_pull(skb, len);
 		skcb = brcmf_skbcb(skb);
 		skcb->mac = entry;
 		skcb->state = BRCMF_FWS_SKBSTATE_TIM;
--
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