qapi/commands: refactor error handling code

Move error_propagate() to if (err) and make "if (err)" block mandatory.
This is to simplify further commit, which will bring trace events
generation for QMP commands.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20220126161130.3240892-3-vsementsov@virtuozzo.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/devel/qapi-code-gen.rst b/docs/devel/qapi-code-gen.rst
index a3b5473089..feafed79b5 100644
--- a/docs/devel/qapi-code-gen.rst
+++ b/docs/devel/qapi-code-gen.rst
@@ -1690,8 +1690,8 @@ Example::
         }
 
         retval = qmp_my_command(arg.arg1, &err);
-        error_propagate(errp, err);
         if (err) {
+            error_propagate(errp, err);
             goto out;
         }