Fix potential further crashes like the one in fdo#50868

Change-Id: I8bdce8091d7f93b311cb4e15134eb2d7c34ae22f

libwpd/libwpd-0.9.4.patch

+--- misc/libwpd-0.9.4/src/lib/WPXBinaryData.cpp	2011-10-28 15:37:48.000000000 +0200
++++ misc/build/libwpd-0.9.4/src/lib/WPXBinaryData.cpp	2012-06-09 00:02:43.293981048 +0200
+@@ -174,7 +174,14 @@
+ const WPXInputStream *WPXBinaryData::getDataStream() const
+ {
+ 	if (m_binaryDataImpl->m_stream)
++	{
+ 		delete (m_binaryDataImpl->m_stream);
+-	return ((m_binaryDataImpl->m_stream) = new WPXMemoryInputStream(&(m_binaryDataImpl->m_buf[0]), m_binaryDataImpl->m_buf.size()));
++		m_binaryDataImpl->m_stream = 0;
++	}
++	if (m_binaryDataImpl->m_buf.empty())
++		return 0;
++	m_binaryDataImpl->m_stream = new WPXMemoryInputStream(&(m_binaryDataImpl->m_buf[0]), m_binaryDataImpl->m_buf.size());
++	return m_binaryDataImpl->m_stream;
+ }
++
+ /* vim:set shiftwidth=4 softtabstop=4 noexpandtab: */

libwpd/makefile.mk

@@ -49,6 +49,9 @@ TARFILE_MD5=c01351d7db2b205de755d58769288224
 BUILD_ACTION=dmake $(MFLAGS) $(CALLMACROS)
 BUILD_DIR=src$/lib
 
+PATCH_FILES=\
+	$(TARFILE_NAME).patch
+
 # --- Targets ------------------------------------------------------
 
 .INCLUDE : set_ext.mk