brcmfmac: stop dequeue upon sk_buff commit failure

In the dequeue worker the function brcmf_commit_skb() is called.
However, instead of increment the credit count upon success it
should break the for loop upon failure. Otherwise, it will result
in an endless loop.
Reviewed-by: NHante Meuleman <meuleman@broadcom.com>
Reviewed-by: NPieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: NArend van Spriel <arend@broadcom.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/brcm80211/brcmfmac/fwsignal.c

@@ -1850,10 +1850,9 @@ static void brcmf_fws_dequeue_worker(struct work_struct *worker)
 			  fws->fifo_credit[fifo]);
 		for (credit = 0; credit < fws->fifo_credit[fifo]; /* nop */) {
 			skb = brcmf_fws_deq(fws, fifo);
-			if (!skb)
+			if (!skb || brcmf_fws_commit_skb(fws, fifo, skb))
 				break;
-			if (!brcmf_fws_commit_skb(fws, fifo, skb) &&
-			    brcmf_skbcb(skb)->if_flags &
+			if (brcmf_skbcb(skb)->if_flags &
 			    BRCMF_SKB_IF_FLAGS_CREDITCHECK_MASK)
 				credit++;
 		}