oleaut32/tests: Fix a string leak (Valgrind).
diff --git a/dlls/oleaut32/tests/typelib.c b/dlls/oleaut32/tests/typelib.c
index 03eda3b..acc60f5 100644
--- a/dlls/oleaut32/tests/typelib.c
+++ b/dlls/oleaut32/tests/typelib.c
@@ -1847,6 +1847,7 @@
     V_BSTR(&paramdescex.varDefaultValue) = SysAllocString(defaultW);
     hres = ICreateTypeInfo_AddFuncDesc(createti, 3, &funcdesc);
     ok(hres == S_OK, "got %08x\n", hres);
+    SysFreeString(V_BSTR(&paramdescex.varDefaultValue));
 
     hres = ITypeInfo2_GetFuncDesc(ti2, 3, &pfuncdesc);
     ok(hres == S_OK, "got %08x\n", hres);