examples/sslbackend: fix -Wchar-subscripts warning #4503
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With the
isdigit
implementation that comes with MSYS2, the argumentis used as an array subscript, resulting in a -Wchar-subscripts
warning.
isdigit
's behavior is undefined if the argument is negativeand not EOF [0]. As done in lib/curl_ctype.h, cast the
char
variableto
unsigned char
to avoid that.[0] https://en.cppreference.com/w/c/string/byte/isdigit