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examples/sslbackend: fix -Wchar-subscripts warning #4503
With the `isdigit` implementation that comes with MSYS2, the argument is used as an array subscript, resulting in a -Wchar-subscripts warning. `isdigit`'s behavior is undefined if the argument is negative and not EOF . As done in lib/curl_ctype.h, cast the `char` variable to `unsigned char` to avoid that.  https://en.cppreference.com/w/c/string/byte/isdigit Closes