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fb24c965 - libxml: Fix possible null pointer access (regression 2023-05-26).

libxml: Fix possible null pointer access (regression 2023-05-26). Pinpointed by gcc 13 warning: warning: dereference of NULL ‘clone’ [CWE-476] [-Wanalyzer-null-dereference] * gnulib-local/lib/libxml/tree.c (xmlDOMWrapCloneNode): Assign clone from cloneAttr.