enh(stream): forbid source db replica > 1

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

@@ -633,6 +633,7 @@ static int32_t mndProcessCreateStreamReq(SRpcMsg *pReq) {
     pDb = NULL;
     goto _OVER;
   }
+  mndReleaseDb(pMnode, pDb);
 
   STrans *pTrans = mndTransCreate(pMnode, TRN_POLICY_ROLLBACK, TRN_CONFLICT_DB_INSIDE, pReq, "create-stream");
   if (pTrans == NULL) {

tests/system-test/1-insert/drop.py

@@ -132,7 +132,7 @@ class TDTestCase:
         tdSql.execute(f'drop database {self.dbname}')
 
     def drop_stream_check(self):
-        tdSql.execute(f'create database {self.dbname} replica {self.replicaVar}')
+        tdSql.execute(f'create database {self.dbname} replica 1')
         tdSql.execute(f'use {self.dbname}')
         stbname = tdCom.getLongName(5,"letters")
         stream_name = tdCom.getLongName(5,"letters")
@@ -158,4 +158,4 @@ class TDTestCase:
         tdLog.success("%s successfully executed" % __file__)
 
 tdCases.addWindows(__file__, TDTestCase())
-tdCases.addLinux(__file__, TDTestCase())
\ No newline at end of file
+tdCases.addLinux(__file__, TDTestCase())