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https://bugzilla.gnome.org/show_bug.cgi?id=763071
* xmlstring.c: (xmlStrncat): Return NULL if xmlStrlen returns a negative length. (xmlStrncatNew): Ditto.
8fbbf551
* xmlstring.c: (xmlStrncat): Return NULL if xmlStrlen returns a negative length. (xmlStrncatNew): Ditto.