spoolss: clear DriverInfo on GetPrinterDriver2 error
In handling a spoolss GetPrinterDriver2 request, the handler may
return an immediate error if one of the input parameters is invalid.
If this is done without zeroing the pre-allocated @info pointer, then
marshalling of the response will fail.
Bug: https://bugzilla.samba.org/show_bug.cgi?id=10984
Signed-off-by: David Disseldorp <ddiss@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
(cherry picked from commit
fb9ecb044ee986ab3496da6cbad162a224378475)