Don't send ACK to modem for a 2nd close request

For the case the modem sends a close request for
the same connection handle do not process the
request and do not ACK to the modem

CRs-fixed: 2269123

Change-Id: I027c3e79965bb0f9ab311093904e6dded1aa5d03
diff --git a/gnss/Agps.cpp b/gnss/Agps.cpp
index 4d01ba7..2470b81 100644
--- a/gnss/Agps.cpp
+++ b/gnss/Agps.cpp
@@ -599,7 +599,6 @@
     if (sm == NULL) {
         LOC_LOGE("Subscriber with connHandle %d not found in any SM",
                     connHandle);
-        mAtlCloseStatusCb(connHandle, 0);
         return;
     }