coverity#1343619 Unchecked return value

Change-Id: Icc27e275d376b3ff66d0e44eb23e62f57f9cc470

forms/source/xforms/submission/submission_get.cxx

@@ -88,7 +88,8 @@ CSubmission::SubmissionResult CSubmissionGet::submit(const css::uno::Reference<
         OUString aQueryURL = OStringToOUString(aUTF8QueryURL.makeStringAndClear(), RTL_TEXTENCODING_UTF8);
         ucbhelper::Content aContent(aQueryURL, aEnvironment, m_xContext);
         css::uno::Reference< XOutputStream > aPipe( css::io::Pipe::create(m_xContext), UNO_QUERY_THROW );
-        aContent.openStream(aPipe);
+        if (!aContent.openStream(aPipe))
+            return UNKNOWN_ERROR;
         // get reply
         try {
             m_aResultStream = aContent.openStream();