comctl32/tests: fix a compiler warning on NetBSD

[Austin English]

See bug 18162. Also tested on Windows XP.

-- 
-Austin
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diff --git a/dlls/comctl32/tests/treeview.c b/dlls/comctl32/tests/treeview.c
index 05a5237..dde3b29 100644
--- a/dlls/comctl32/tests/treeview.c
+++ b/dlls/comctl32/tests/treeview.c
@@ -276,7 +276,7 @@ static void TestCallback(void)
     CHAR buf[128];
     LRESULT ret;
 
-    TreeView_DeleteAllItems(hTree);
+    (void) TreeView_DeleteAllItems(hTree);
     ins.hParent = TVI_ROOT;
     ins.hInsertAfter = TVI_ROOT;
     U(ins).item.mask = TVIF_TEXT;
@@ -301,7 +301,7 @@ static void TestCallback(void)
     assert(hItem1);
 
     tvi.hItem = hItem1;
-    TreeView_GetItem(hTree, &tvi);
+    (void) TreeView_GetItem(hTree, &tvi);
     ok(strcmp(tvi.pszText, test_string) == 0, "Item text mismatch %s vs %s\n",
         tvi.pszText, test_string);
 
@@ -310,7 +310,7 @@ static void TestCallback(void)
     ret = TreeView_SetItem(hTree, &tvi);
     ok(ret == 1, "Expected SetItem return 1, got %ld\n", ret);
     tvi.pszText = buf;
-    TreeView_GetItem(hTree, &tvi);
+    (void) TreeView_GetItem(hTree, &tvi);
     ok(strcmp(tvi.pszText, TEST_CALLBACK_TEXT) == 0, "Item text mismatch %s vs %s\n",
         tvi.pszText, TEST_CALLBACK_TEXT);
 
@@ -319,7 +319,7 @@ static void TestCallback(void)
     assert(hItem2);
     tvi.hItem = hItem2;
     memset(buf, 0, sizeof(buf));
-    TreeView_GetItem(hTree, &tvi);
+    (void) TreeView_GetItem(hTree, &tvi);
     ok(strcmp(tvi.pszText, TEST_CALLBACK_TEXT) == 0, "Item text mismatch %s vs %s\n",
         tvi.pszText, TEST_CALLBACK_TEXT);
 }
@@ -766,7 +766,7 @@ static void TestExpandInvisible(void)
      *
      */
 
-    TreeView_DeleteAllItems(hTree);
+    (void) TreeView_DeleteAllItems(hTree);
 
     ins.hParent = TVI_ROOT;
     ins.hInsertAfter = TVI_ROOT;