s3:rpcclient: Initialize spoolss_DriverDirectoryInfo info

s3:rpcclient: Initialize spoolss_DriverDirectoryInfo info

Error: UNINIT (CWE-457):
samba-4.20.0rc2/source3/rpcclient/cmd_spoolss.c:1530: var_decl: Declaring variable "info" without initializer.
samba-4.20.0rc2/source3/rpcclient/cmd_spoolss.c:1578: uninit_use_in_call: Using uninitialized value "info" when calling "display_printdriverdir_1".
 1576|
 1577|           if (W_ERROR_IS_OK(result)) {
 1578|->                 display_printdriverdir_1(&info.info1);
 1579|           }
 1580|

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