qapi: Consistent generated code: prefer common labels

We had some pointless differences in the generated code for visit,
command marshalling, and events; unifying them makes it easier for
future patches to consolidate to common helper functions.
This is one patch of a series to clean up these differences.

This patch names the goto labels 'out' (not 'clean') and 'out_obj'
(not 'out_end').  Additionally, the generator was inconsistent on
whether labels had a leading space [our HACKING is silent; while
emacs 'gnu' style adds the space to avoid littering column 1].
For minimal churn, prefer no leading space; this also matches
the style that is more prevalent in current qemu.git.

No change in semantics to the generated code.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1443565276-4535-13-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

scripts/qapi-event.py

@@ -69,7 +69,7 @@ def gen_event_send(name, arg_type):
     /* Fake visit, as if all members are under a structure */
     visit_start_struct(v, NULL, "", "%(name)s", 0, &err);
     if (err) {
-        goto clean;
+        goto out;
     }
 
 ''',
@@ -92,7 +92,7 @@ def gen_event_send(name, arg_type):
             ret += mcgen('''
     visit_type_%(c_type)s(v, %(cast)s&%(c_name)s, "%(name)s", &err);
     if (err) {
-        goto clean;
+        goto out;
     }
 ''',
                          cast=cast,
@@ -110,7 +110,7 @@ def gen_event_send(name, arg_type):
 
     visit_end_struct(v, &err);
     if (err) {
-        goto clean;
+        goto out;
     }
 
     obj = qmp_output_get_qobject(qov);
@@ -127,7 +127,7 @@ def gen_event_send(name, arg_type):
 
     if arg_type and arg_type.members:
         ret += mcgen('''
- clean:
+out:
     qmp_output_visitor_cleanup(qov);
 ''')
     ret += mcgen('''

scripts/qapi-visit.py

@@ -209,7 +209,7 @@ def gen_visit_alternate(name, variants):
     }
     visit_get_next_type(v, (int*) &(*obj)->kind, %(c_name)s_qtypes, name, &err);
     if (err) {
-        goto out_end;
+        goto out_obj;
     }
     switch ((*obj)->kind) {
 ''',
@@ -230,7 +230,7 @@ def gen_visit_alternate(name, variants):
     default:
         abort();
     }
-out_end:
+out_obj:
     error_propagate(errp, err);
     err = NULL;
     visit_end_implicit_struct(v, &err);