janitorial: Close COM after tests.

dlls/quartz/tests/filtergraph.c

@@ -298,4 +298,5 @@ START_TEST(filtergraph)
     test_graph_builder_addfilter();
     test_mediacontrol();
     test_filter_graph2();
+    CoUninitialize();
 }

dlls/quartz/tests/memallocator.c

@@ -87,4 +87,6 @@ START_TEST(memallocator)
     CoInitialize(NULL);
 
     CommitDecommitTest();
+
+    CoUninitialize();
 }

dlls/quartz/tests/misc.c

@@ -173,4 +173,6 @@ START_TEST(misc)
 
     test_video_renderer_aggregations();
     test_filter_graph_aggregations();
+
+    CoUninitialize();
 }

dlls/quartz/tests/referenceclock.c

@@ -110,4 +110,6 @@ START_TEST(referenceclock)
     CoInitialize(NULL);
 
     test_IReferenceClock_SystemClock();
+
+    CoUninitialize();
 }

dlls/quartz/tests/videorenderer.c

@@ -160,4 +160,6 @@ START_TEST(videorenderer)
     test_basefilter();
 
     release_video_renderer();
+
+    CoUninitialize();
 }

dlls/shell32/tests/string.c

@@ -110,4 +110,6 @@ START_TEST(string)
         else
             test_StrRetToStringNA();
     }
+
+    CoUninitialize();
 }

dlls/shlwapi/tests/string.c

@@ -957,4 +957,6 @@ START_TEST(string)
   test_SHAnsiToAnsi();
   test_SHUnicodeToUnicode();
   test_StrXXX_overflows();
+
+  CoUninitialize();
 }