[gnutls-devel] GnuTLS | Datum.c cleanup (!1002)

[Development of GNU's TLS library]

Nikos Mavrogiannopoulos commented on a discussion on lib/datum.c: https://gitlab.com/gnutls/gnutls/merge_requests/1002#note_172463387

>  		return 0;
>  	}
>  
> -	dat->data = gnutls_malloc(data_size);

It may be in general but in this particular case it looks like a safety feature. Both of these functions are initialization functions, and for code like:
```
_gnutls_set_datum(x, "y", 1);
printf("%s", x.data);
```
when allocation fails, they will prevent an uninitialized x.data to be passed to printf().

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