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

[Development of GNU's TLS library]

Nikos Mavrogiannopoulos commented on a discussion on lib/str.c: https://gitlab.com/gnutls/gnutls/merge_requests/1092#note_230219751

>  	gnutls_datum_t tdata;
>  
>  	_gnutls_buffer_pop_datum(str, &tdata, req_size);
> -	if (tdata.data == NULL || tdata.size != req_size) {
> +	if (tdata.data == NULL || tdata.size > req_size) {

Maybe documenting the existing behavior more clearly is better solution than this fix. The existing users of this function rely on the previous behavior.

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