fix: memory leak while subscribe

source/dnode/mnode/impl/src/mndScheduler.c

@@ -585,6 +585,8 @@ int32_t mndSchedInitSubEp(SMnode* pMnode, const SMqTopicObj* pTopic, SMqSubscrib
     } else {
       pVgEp->qmsg = strdup("");
     }
+
+    sdbRelease(pSdb, pVgroup);
   }
 
   ASSERT(pSub->unassignedVgs->size > 0);

source/dnode/mnode/impl/src/mndTopic.c

@@ -512,6 +512,8 @@ static int32_t mndCreateTopic(SMnode *pMnode, SRpcMsg *pReq, SCMCreateTopicReq *
         mndTransDrop(pTrans);
         return -1;
       }
+
+      sdbRelease(pSdb, pVgroup);
     }
   }