s3/libads: clang: Fix 'Value stored during its initialization is never read'

s3/libads: clang: Fix 'Value stored during its initialization is never read'

Fixes:

source3/libads/ldap.c:370:11: warning: Value stored to 'status' during its initialization is never read <--[clang]
        NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
                 ^~~~~~   ~~~~~~~~~~~~~~~~~~~~~~
source3/libads/ldap.c:417:11: warning: Value stored to 'status' during its initialization is never read <--[clang]
        NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
                 ^~~~~~   ~~~~~~~~~~~~~~~~~~~~~~
source3/libads/ldap.c:1783:13: warning: Value stored to 'ret' during its initialization is never read <--[clang]
        ADS_STATUS ret = ADS_ERROR(LDAP_SUCCESS);
                   ^~~   ~~~~~~~~~~~~~~~~~~~~~~~
source3/libads/ldap.c:1862:13: warning: Value stored to 'ret' during its initialization is never read <--[clang]
        ADS_STATUS ret = ADS_ERROR(LDAP_SUCCESS);
                   ^~~   ~~~~~~~~~~~~~~~~~~~~~~~
4 warnings generated.

Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Jeremy Allison <jra@samba.org>