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87fa86ba - libtextstyle: Don't crash if xgethostname() returns NULL.

libtextstyle: Don't crash if xgethostname() returns NULL. Pinpointed by gcc 13 warning: warning: dereference of possibly-NULL ‘p’ [CWE-690] [-Wanalyzer-possible-null-dereference] * libtextstyle/gnulib-local/lib/term-ostream.oo.c (term_ostream_create): If xgethostname() returns NULL, use a dummy hash code.