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Chong Yidong authored
* src/fileio.c (Ffile_name_directory, Ffile_name_nondirectory) (Funhandled_file_name_directory, Ffile_name_as_directory) (Fdirectory_file_name, Fexpand_file_name) (Fsubstitute_in_file_name): Protect against invalid file handler return values. Fixes: debbugs:10845
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