NSS: Fix warning enumerated type mixed with another type
src/responder/nss/nsssrv_cmd.c:688: mixed_enum_type: enumerated type mixed with
another type
"enum sss_dp_acct_type" was mixed with type "int". ANSI C is not very
strict in this.
Reviewed-by: Michal Židek <mzidek@redhat.com>