s4:torture: Initialize struct smb_nttrans

s4:torture: Initialize struct smb_nttrans

"Error: UNINIT (CWE-457):
samba-4.20.0rc2/source4/torture/basic/scanner.c:368: var_decl: Declaring variable ""parms"" without initializer.
samba-4.20.0rc2/source4/torture/basic/scanner.c:388: uninit_use_in_call: Using uninitialized value ""parms.in.setup"" when calling ""smb_raw_nttrans"".
  386|   	parms.in.data = ntdata_blob;
  387|
  388|-> 	status = smb_raw_nttrans(cli->tree, mem_ctx, &parms);
  389|
  390|   	if (NT_STATUS_IS_ERR(status)) {"

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Guenther Deschner <gd@samba.org>