[ASAN] set-origin: Squash a leak

Just a minor leak in the commandline.

Closes: #598
Approved by: jlebon

src/ostree/ot-admin-builtin-set-origin.c

@@ -50,7 +50,7 @@ ot_admin_builtin_set_origin (int argc, char **argv, GCancellable *cancellable, G
   const char *branch = NULL;
   glnx_unref_object OstreeRepo *repo = NULL;
   glnx_unref_object OstreeSysroot *sysroot = NULL;
-  OstreeDeployment *target_deployment = NULL;
+  glnx_unref_object OstreeDeployment *target_deployment = NULL;
 
   context = g_option_context_new ("REMOTENAME URL [BRANCH]");
 
@@ -85,6 +85,8 @@ ot_admin_builtin_set_origin (int argc, char **argv, GCancellable *cancellable, G
                                "Not currently booted into an OSTree system");
           goto out;
         }
+      /* To match the below */
+      target_deployment = g_object_ref (target_deployment);
     }
   else
     {