vbscript: Fix return value of lookup_identifier().

Signed-off-by: Robert Wilhelm <robert.wilhelm@gmx.net>
Signed-off-by: Jacek Caban <jacek@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/vbscript/interp.c

@@ -146,7 +146,7 @@ static HRESULT lookup_identifier(exec_ctx_t *ctx, BSTR name, vbdisp_invoke_type_
             if(!wcsicmp(ctx->func->vars[i].name, name)) {
                 ref->type = REF_VAR;
                 ref->u.v = ctx->vars+i;
-                return TRUE;
+                return S_OK;
             }
         }