tools: ynl: fix converting flags to names after recent cleanup

JIRA: https://issues.redhat.com/browse/RHEL-31945

commit 9fea94d
Author: Jakub Kicinski <kuba@kernel.org>
Date:   Mon Oct 16 14:39:37 2023 -0700

    tools: ynl: fix converting flags to names after recent cleanup
    
    I recently cleaned up specs to not specify enum-as-flags
    when target enum is already defined as flags.
    YNL Python library did not convert flags, unfortunately,
    so this caused breakage for Stan and Willem.
    
    Note that the nlspec.py abstraction already hides the differences
    between flags and enums (value vs user_value), so the changes
    are pretty trivial.
    
    Fixes: 0629f22 ("ynl: netdev: drop unnecessary enum-as-flags")
    Reported-and-tested-by: Willem de Bruijn <willemb@google.com>
    Reported-and-tested-by: Stanislav Fomichev <sdf@google.com>
    Link: https://lore.kernel.org/all/ZS10NtQgd_BJZ3RU@google.com/
    Link: https://lore.kernel.org/r/20231016213937.1820386-1-kuba@kernel.org
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Signed-off-by: Jose Ignacio Tornos Martinez <jtornosm@redhat.com>

Author: jtornosm

tools/net/ynl/lib/ynl.py

@@ -474,7 +474,7 @@ def _add_attr(self, space, name, value):
 
     def _decode_enum(self, raw, attr_spec):
         enum = self.consts[attr_spec['enum']]
-        if 'enum-as-flags' in attr_spec and attr_spec['enum-as-flags']:
+        if enum.type == 'flags' or attr_spec.get('enum-as-flags', False):
             i = 0
             value = set()
             while raw: