s3/libsmb: clang: Fix 'Value stored to 'create_options' is never read'

s3/libsmb: clang: Fix 'Value stored to 'create_options' is never read'

It looks like the create_options are accumulated as the depending on the
failure reasons returned for cli_smb2_create_fnum (except for when a
directory is encountered) this looks like a mistake
Fixes:

source3/libsmb/cli_smb2_fnum.c:1870:3: warning: Value stored to 'create_options' is never read <--[clang]
                create_options |= FILE_DIRECTORY_FILE;
                ^
Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Ralph Boehme <slow@samba.org>