[gnutls-devel] GnuTLS | Fix coverity in lib/ (!1092)

[Development of GNU's TLS library]

Tim Rühsen commented on a discussion on lib/str.c: https://gitlab.com/gnutls/gnutls/merge_requests/1092#note_229648567

>  
>  	while (pos < dest->length) {
>  		if (dest->data[pos] == '%') {
> -			char b[3];
> -			unsigned int u;
>  			unsigned char x;
>  
> -			b[0] = dest->data[pos + 1];
> -			b[1] = dest->data[pos + 2];
> -			b[2] = 0;
> -
> -			sscanf(b, "%02x", &u);
> -
> -			x = u;
> +			hex_decode((char *) dest->data + pos + 1, 2, &x, 1);

Pushed a unit test for _gnutls_buffer_unescape() which of course fails until we agree on writing `_gnutls_buffer_append_unescape()`. If we don't agree, i have to fix `_gnutls_buffer_unescape()` by other means.

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