Fix bug that occurs when LLPC deactivates asynchronously.

Bug steps:
1. A P2P connection is established.
2. The NFC radio is shutdown. (e.g. to apply a new radio config.)
3. LLCP is told to deactivate itself.
4. LLCP starts an asynchronous operation as part of its deactivation.
5. When the asynchronous operation completes, LLCP starts a new state
transition, which overrides the currently executing state transition
(that was started in Step 2). This messes up the state of a driver,
causing a fatal error to occur.

This change ensures that in Step 5, LLCP resumes the current state
transition instead of starting a new one.

Cx/NfcCxLLCP.cpp

@@ -122,7 +122,16 @@ NfcCxLLCPInterfaceLinkStatusCB(
         {
             NfcCxRFInterfaceP2pConnectionLost(RFInterface);
             NfcCxSNEPInterfaceDeinit(NfcCxLLCPInterfaceGetLibNfcContext(LLCPInterface)->SNEPInterface);
-            NfcCxPostLibNfcThreadMessage(RFInterface, LIBNFC_STATE_HANDLER, NfcCxEventDeactivated, NULL, NULL, NULL);
+
+            if (LLCPInterface->IsDeactivatePending)
+            {
+                LLCPInterface->IsDeactivatePending = false;
+                NfcCxInternalSequence(NfcCxLLCPInterfaceGetRFInterface(LLCPInterface), NfcCxLLCPInterfaceGetRFInterface(LLCPInterface)->pSeqHandler, STATUS_SUCCESS, NULL, NULL);
+            }
+            else
+            {
+                NfcCxPostLibNfcThreadMessage(RFInterface, LIBNFC_STATE_HANDLER, NfcCxEventDeactivated, NULL, NULL, NULL);
+            }
         }
         break;
     }
@@ -247,6 +256,10 @@ NfcCxLLCPInterfaceDeactivate(
 
     if (LLCPInterface->eLinkStatus == phFriNfc_LlcpMac_eLinkActivated) {
         nfcStatus = phLibNfc_Llcp_Deactivate(RFInterface->pLibNfcContext->pRemDevList[0].hTargetDev);
+        if (nfcStatus == NFCSTATUS_PENDING)
+        {
+            LLCPInterface->IsDeactivatePending = true;
+        }
     }
 
     Status = NfcCxNtStatusFromNfcStatus(nfcStatus);

Cx/NfcCxLLCP.h

@@ -43,6 +43,7 @@ typedef struct _NFCCX_LLCP_INTERFACE {
     phLibNfc_Llcp_sLinkParameters_t     sLocalLinkInfo;
     phNfc_sData_t                       sServiceName;
     UCHAR                               eRequestState;
+    bool                                IsDeactivatePending;
 } NFCCX_LLCP_INTERFACE, *PNFCCX_LLCP_INTERFACE;
 
 typedef struct _NFCCX_LLCP_LIBNFC_REQUEST_CONTEXT {