Fix a memory leak in fts5.

FossilOrigin-Name: ff3b011f17f4f02e486f3c8de607f62eddf3b86562e2df82dba57ea166994b65

ext/fts5/fts5_index.c

@@ -3403,7 +3403,6 @@ static void fts5MultiIterNew(
   pNew->bRev = (0!=(flags & FTS5INDEX_QUERY_DESC));
   pNew->bSkipEmpty = (0!=(flags & FTS5INDEX_QUERY_SKIPEMPTY));
   pNew->pColset = pColset;
-  fts5StructureRef(pStruct);
   if( (flags & FTS5INDEX_QUERY_NOOUTPUT)==0 ){
     fts5IterSetOutputCb(&p->rc, pNew);
   }

ext/fts5/test/fts5update.test

@@ -134,5 +134,10 @@ do_test 3.1 {
   }
 } {}
 
+
 }
+
+reset_db
+do_catchsql_test 4.0 { CREATE VIRTUAL TABLE t1 USING fts5(a,b,c); } {0 {}}
+do_catchsql_test 4.1 { DELETE FROM t1 WHERE t1 MATCH 'f*'; } {0 {}}
 finish_test