s3:registry: Initialize struct security_ace ace[]

s3:registry: Initialize struct security_ace ace[]

Error: UNINIT (CWE-457):
samba-4.20.0rc2/source3/registry/reg_dispatcher.c:43: var_decl: Declaring variable "ace" without initializer.
samba-4.20.0rc2/source3/registry/reg_dispatcher.c:66: uninit_use_in_call: Using uninitialized value "*ace". Field "ace->object" is uninitialized when calling "make_sec_acl".
  64|           /* create the security descriptor */
  65|
  66|->         theacl = make_sec_acl(ctx, NT4_ACL_REVISION, i, ace);
  67|           if (theacl == NULL) {
  68|                   return WERR_NOT_ENOUGH_MEMORY;

Signed-off-by: Pavel Filipenský <pfilipensky@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>