WMI: add timeout to prevent CI from hanging

Hard coded 5 seconds

src/util/windows/wmi.cpp

@@ -111,9 +111,7 @@ FFWmiQuery::FFWmiQuery(const wchar_t* queryStr, FFstrbuf* error, FFWmiNamespace
     }
 
     // Use the IWbemServices pointer to make requests of WMI
-    HRESULT hres;
-
-    hres = ((IWbemServices*)context)->ExecQuery(
+    HRESULT hres = ((IWbemServices*)context)->ExecQuery(
         bstr_t(L"WQL"),
         bstr_t(queryStr),
         WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,

src/util/windows/wmi.hpp

@@ -18,6 +18,10 @@ enum class FFWmiNamespace {
     LAST,
 };
 
+enum {
+    FF_WMI_QUERY_TIMEOUT = 5000
+};
+
 struct FFWmiRecord
 {
     IWbemClassObject* obj;
@@ -26,7 +30,7 @@ struct FFWmiRecord
         if(!pEnumerator) return;
 
         ULONG ret;
-        bool ok = SUCCEEDED(pEnumerator->Next((LONG)WBEM_INFINITE, 1, &obj, &ret)) && ret;
+        bool ok = SUCCEEDED(pEnumerator->Next(FF_WMI_QUERY_TIMEOUT, 1, &obj, &ret)) && ret;
         if(!ok) obj = nullptr;
     }
     FFWmiRecord(const FFWmiRecord&) = delete;