[PATCH] qapi: Fix crash on missing enum member name

[Markus Armbruster <armbru@redhat.com>]

New test case enum-dict-no-name.json crashes:

    $ python3 scripts/qapi-gen.py tests/qapi-schema/enum-dict-no-name.json
    Traceback (most recent call last):
    [...]
      File "/work/armbru/qemu/scripts/qapi/expr.py", line 458, in check_enum
	member_name = member['name']
    KeyError: 'name'

Root cause: we try to retrieve member 'name' before we check for
missing members.  With that fixed, we get the expected error "'data'
member misses key 'name'".

Fixes: 0825f62c842f2c07c5471391c6d7fd3f4fe83732
Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 scripts/qapi/expr.py                     | 2 +-
 tests/qapi-schema/enum-dict-no-name.err  | 2 ++
 tests/qapi-schema/enum-dict-no-name.json | 2 ++
 tests/qapi-schema/enum-dict-no-name.out  | 0
 4 files changed, 5 insertions(+), 1 deletion(-)
 create mode 100644 tests/qapi-schema/enum-dict-no-name.err
 create mode 100644 tests/qapi-schema/enum-dict-no-name.json
 create mode 100644 tests/qapi-schema/enum-dict-no-name.out

diff --git a/scripts/qapi/expr.py b/scripts/qapi/expr.py
index 496f7e0333..cf98923fa6 100644
--- a/scripts/qapi/expr.py
+++ b/scripts/qapi/expr.py
@@ -455,8 +455,8 @@ def check_enum(expr: _JSONObject, info: QAPISourceInfo) -> None:
                   for m in members]
     for member in members:
         source = "'data' member"
-        member_name = member['name']
         check_keys(member, info, source, ['name'], ['if'])
+        member_name = member['name']
         check_name_is_str(member_name, info, source)
         source = "%s '%s'" % (source, member_name)
         # Enum members may start with a digit
diff --git a/tests/qapi-schema/enum-dict-no-name.err b/tests/qapi-schema/enum-dict-no-name.err
new file mode 100644
index 0000000000..3ce0c16987
--- /dev/null
+++ b/tests/qapi-schema/enum-dict-no-name.err
@@ -0,0 +1,2 @@
+enum-dict-no-name.json: In enum 'Enum':
+enum-dict-no-name.json:2: 'data' member misses key 'name'
diff --git a/tests/qapi-schema/enum-dict-no-name.json b/tests/qapi-schema/enum-dict-no-name.json
new file mode 100644
index 0000000000..5952a8662e
--- /dev/null
+++ b/tests/qapi-schema/enum-dict-no-name.json
@@ -0,0 +1,2 @@
+# enum member lacking a name
+{ 'enum': 'Enum', 'data': [ {} ] }
diff --git a/tests/qapi-schema/enum-dict-no-name.out b/tests/qapi-schema/enum-dict-no-name.out
new file mode 100644
index 0000000000..e69de29bb2
-- 
2.31.1