Fix NULL pointer dereferences and logging in WAN status event handler

[Copilot]

Addresses code safety and observability issues in PR rdkcentral#66's WAN Manager RBUS integration.

Changes

NULL Pointer Safety (cosa_rbus_handler_apis.c)

Added defensive checks preventing crashes when RBUS returns NULL:

rbusValue_t value = rbusObject_GetValue(event->data, NULL);
if (value != NULL) {
    const char* statusStr = rbusValue_GetString(value, NULL);
    if (statusStr != NULL) {
        // Safe to use statusStr
    } else {
        CcspTraceError(("%s %d : FAILED , rbusValue_GetString returned NULL\n",__FUNCTION__, __LINE__));
        return;
    }
}

Code Quality

• Removed redundant initialization of rc variable (immediately overwritten)

Logging Enhancement (network_response.sh)

Added Hotspot interface status to diagnostic output:

echo_t "... Interface_Available_Status: $Interface_Available_Status  HS_Interface_Available_Status: $HS_Interface_Available_Status"

Original prompt

Can you review this PR rdkcentral#66

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