libsmb: Use a direct struct initializer

There's a few ways to initialize a DATA_BLOB to NULL. There's the
variable data_blob_null, there's ZERO_STRUCTP, and the explicit
initializer. And there's the data_blob() macro which calls into
data_blob_talloc_named. You have to look at that routine to see that
this is nothing more than a ZERO_STRUCT() and not calling into
talloc. Choose the more direct way.

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

libcli/smb/smb2_create_blob.c

@@ -159,7 +159,7 @@ NTSTATUS smb2_create_blob_push(TALLOC_CTX *mem_ctx, DATA_BLOB *buffer,
 	uint32_t i;
 	NTSTATUS status;
 
-	*buffer = data_blob(NULL, 0);
+	*buffer = (DATA_BLOB) { 0 };
 	for (i=0; i < blobs.num_blobs; i++) {
 		bool last = false;
 		const struct smb2_create_blob *c;