[PATCH 5/5] qapi: Fix bogus error for 'if': { 'not': '' }

[Markus Armbruster <armbru@redhat.com>]

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 scripts/qapi/expr.py             | 21 +++++++++++++--------
 tests/qapi-schema/bad-if-not.err |  2 +-
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/scripts/qapi/expr.py b/scripts/qapi/expr.py
index b62f0a3640..ad3732c7f0 100644
--- a/scripts/qapi/expr.py
+++ b/scripts/qapi/expr.py
@@ -293,17 +293,22 @@ def _check_if(cond: Union[str, object]) -> None:
                 info,
                 "'if' condition of %s has conflicting keys" % source)
 
-        oper, operands = next(iter(cond.items()))
+        if 'not' in cond:
+            _check_if(cond['not'])
+        elif 'all' in cond:
+            _check_infix('all', cond['all'])
+        else:
+            _check_infix('any', cond['any'])
+
+    def _check_infix(operator: str, operands: object):
+        if not isinstance(operands, list):
+            raise QAPISemError(
+                info,
+                "'%s' condition of %s must be an array"
+                % (operator, source))
         if not operands:
             raise QAPISemError(
                 info, "'if' condition [] of %s is useless" % source)
-
-        if oper == "not":
-            _check_if(operands)
-            return
-        if oper in ("all", "any") and not isinstance(operands, list):
-            raise QAPISemError(
-                info, "'%s' condition of %s must be an array" % (oper, source))
         for operand in operands:
             _check_if(operand)
 
diff --git a/tests/qapi-schema/bad-if-not.err b/tests/qapi-schema/bad-if-not.err
index b3acdd679a..b33f5e16b8 100644
--- a/tests/qapi-schema/bad-if-not.err
+++ b/tests/qapi-schema/bad-if-not.err
@@ -1,2 +1,2 @@
 bad-if-not.json: In struct 'TestIfStruct':
-bad-if-not.json:2: 'if' condition [] of struct is useless
+bad-if-not.json:2: 'if' condition '' of struct is not a valid identifier
-- 
2.31.1