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* lib/argp-help.c (SKIPWS): Cast character to 'unsigned char' before passing it to isspace(). (fill_in_uparams): Likewise for isalpha(), isalnum(), isdigit(). (canon_doc_option): Likewise for isspace(), isalnum(). Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>