qapi: Fix up commit 7618b91's clash sanity checking change

This hunk

    @@ -964,6 +965,7 @@ class QAPISchemaObjectType(QAPISchemaType):
                 members = []
             seen = {}
             for m in members:
    +            assert c_name(m.name) not in seen
                 seen[m.name] = m
             for m in self.local_members:
                 m.check(schema, members, seen)

is plainly broken.

Asserting the members inherited from base don't clash is somewhat
redundant, because self.base.check() just checked that.  But it
doesn't hurt.

The idea to use c_name(m.name) instead of m.name for collision
checking is sound, because we need to catch clashes between the m.name
and between the c_name(m.name), and when two m.name clash, then their
c_name() also clash.

However, using c_name(m.name) instead of m.name in one of several
places doesn't work.  See the very next line.

Keep the assertion, but drop the c_name() for now.  A future commit
will bring it back.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1446559499-26984-4-git-send-email-armbru@redhat.com>
[change TABs in commit message to space]
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1447836791-369-8-git-send-email-eblake@redhat.com>
