[patch] mwifiex: potential integer underflow in mwifiex_ret_wmm_get_status()

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If "resp_len" gets set to negative then it counts as a high positive
value.

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
I spotted this reviewing the int => bool changes, but I don't have the
hardware and can't test it.

diff --git a/drivers/net/wireless/mwifiex/wmm.c b/drivers/net/wireless/mwifiex/wmm.c
index 2e8f9cd..3c6ee3a 100644
--- a/drivers/net/wireless/mwifiex/wmm.c
+++ b/drivers/net/wireless/mwifiex/wmm.c
@@ -772,6 +772,8 @@ int mwifiex_ret_wmm_get_status(struct mwifiex_private *priv,
 			break;
 		}
 
+		if (resp_len < tlv_len + sizeof(tlv_hdr->header))
+			break;
 		curr += (tlv_len + sizeof(tlv_hdr->header));
 		resp_len -= (tlv_len + sizeof(tlv_hdr->header));
 	}
--
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