qom: Improve error message displayed with missing object properties

Instead of only displaying the property missing, also display
the object name. This help developer to quickly figure out the
mistake without opening a debugger.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200920155340.401482-1-f4bug@amsat.org>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

qom/object.c

@@ -1291,7 +1291,8 @@ ObjectProperty *object_property_find_err(Object *obj, const char *name,
 {
     ObjectProperty *prop = object_property_find(obj, name);
     if (!prop) {
-        error_setg(errp, "Property '.%s' not found", name);
+        error_setg(errp, "Property '%s.%s' not found",
+                   object_get_typename(obj), name);
     }
     return prop;
 }