tests/qapi-schema: Cover two more syntax errors

Syntax error coverage should now be complete.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

tests/Makefile

@@ -237,6 +237,7 @@ check-qapi-schema-y := $(addprefix tests/qapi-schema/, \
 	missing-colon.json missing-comma-list.json missing-comma-object.json \
 	nested-struct-data.json non-objects.json \
 	qapi-schema-test.json quoted-structural-chars.json \
+	leading-comma-list.json leading-comma-object.json \
 	trailing-comma-list.json trailing-comma-object.json \
 	unclosed-list.json unclosed-object.json unclosed-string.json \
 	duplicate-key.json union-invalid-base.json union-bad-branch.json \

tests/qapi-schema/leading-comma-list.err

+tests/qapi-schema/leading-comma-list.json:2:13: Expected "{", "[", "]", string, boolean or "null"

tests/qapi-schema/leading-comma-list.exit

+1

tests/qapi-schema/leading-comma-list.json

+{ 'enum': 'Status',
+  'data': [ , 'good', 'bad', 'ugly' ] }

tests/qapi-schema/leading-comma-object.err

+tests/qapi-schema/leading-comma-object.json:1:3: Expected string or "}"

tests/qapi-schema/leading-comma-object.exit

+1

tests/qapi-schema/leading-comma-object.json

+{ , 'enum': 'Status',
+  'data': [ 'good', 'bad', 'ugly' ] }