qom: Change object_get_canonical_path_component() not to malloc

object_get_canonical_path_component() returns a malloced copy of a
property name on success, null on failure.

19 of its 25 callers immediately free the returned copy.

Change object_get_canonical_path_component() to return the property
name directly.  Since modifying the name would be wrong, adjust the
return type to const char *.

Drop the free from the 19 callers become simpler, add the g_strdup()
to the other six.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20200714160202.3121879-4-armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Li Qiang <liq3ea@gmail.com>

2 files changed, 2 insertions, 3 deletions

diff --git a/scsi/pr-manager-helper.c b/scsi/pr-manager-helper.c
index bf62cbec11..5acccfb4e3 100644
--- a/scsi/pr-manager-helper.c
+++ b/scsi/pr-manager-helper.c
@@ -42,11 +42,10 @@ typedef struct PRManagerHelper {
 
 static void pr_manager_send_status_changed_event(PRManagerHelper *pr_mgr)
 {
-    char *id = object_get_canonical_path_component(OBJECT(pr_mgr));
+    const char *id = object_get_canonical_path_component(OBJECT(pr_mgr));
 
     if (id) {
         qapi_event_send_pr_manager_status_changed(id, !!pr_mgr->ioc);
-        g_free(id);
     }
 }
 
diff --git a/scsi/pr-manager.c b/scsi/pr-manager.c
index 0c866e8698..32b9287e68 100644
--- a/scsi/pr-manager.c
+++ b/scsi/pr-manager.c
@@ -128,7 +128,7 @@ static int query_one_pr_manager(Object *object, void *opaque)
 
     elem = g_new0(PRManagerInfoList, 1);
     info = g_new0(PRManagerInfo, 1);
-    info->id = object_get_canonical_path_component(object);
+    info->id = g_strdup(object_get_canonical_path_component(object));
     info->connected = pr_manager_is_connected(pr_mgr);
     elem->value = info;
     elem->next = NULL;