Don't run FilterGraph tests if FilterGraph functionality is not availible

[Jakob Eriksson]

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Index: dlls/quartz/tests/filtergraph.c
===================================================================
RCS file: /home/wine/wine/dlls/quartz/tests/filtergraph.c,v
retrieving revision 1.5
diff -u -r1.5 filtergraph.c
--- dlls/quartz/tests/filtergraph.c	2 Mar 2005 10:12:12 -0000	1.5
+++ dlls/quartz/tests/filtergraph.c	23 Mar 2005 14:40:24 -0000
@@ -31,12 +31,10 @@
 
 IGraphBuilder* pgraph;
 
-static void createfiltergraph()
+static int createfiltergraph()
 {
-    HRESULT hr;
-
-    hr = CoCreateInstance(&CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, &IID_IGraphBuilder, (LPVOID*)&pgraph);
-    ok(hr==S_OK, "Creating filtergraph returned: %lx\n", hr);
+    return S_OK == CoCreateInstance(
+        &CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, &IID_IGraphBuilder, (LPVOID*)&pgraph);
 }
 
 static void renderfile()
@@ -92,7 +90,8 @@
     HANDLE h;
 	
     CoInitialize(NULL);
-    createfiltergraph();
+    if (!createfiltergraph())
+        return;
 
     h = CreateFileW(file, 0, 0, NULL, OPEN_EXISTING, 0, NULL);
     if (h != INVALID_HANDLE_VALUE) {
@@ -103,3 +102,4 @@
 
     releasefiltergraph();
 }
+