tree.c: check that strdup() didn't fail - #740
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Similar checks were added to this file in:
2011-08-25 Tarsnap 1.0.30
c80c7d2
Our use of tree_open() does exit gracefully if it returns NULL,
but other "could we allocate memory?" checks in tree.c use abort().
Reworking that file to have proper error paths would be a much more
invasive change.
Reported by: chengdazhi
Bug bounty: $10 ("harmless")
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