!6527 gs_ctl startwalrcv switch case分支补充break

Merge pull request !6527 from maxiang/yanshihuifang

src/bin/pg_ctl/pg_ctl.cpp

@@ -7506,6 +7506,7 @@ int main(int argc, char** argv)
             } else {
                 pg_log(PG_PROGRESS, _("Another gs_ctl command is still running, start walrcv failed.\n"));
             }
+            break;
         default:
             break;
     }