Remove an ALWAYS() that is actually reachable following an OOM on an

UPDATE FROM of a virtual table.
dbsqlfuzz aa03237ef7c4a028c7cdaf8bbcde2b62e2bcd36e

FossilOrigin-Name: 49eac38926b3391b185d20fae6588c213f7f020f028173d4a4aa3c7a62b94140

src/update.c

@@ -249,7 +249,8 @@ static void updateFromSelect(
     }
 #endif
   }
-  if( ALWAYS(pChanges) ){
+  assert( pChanges!=0 || pParse->db->mallocFailed );
+  if( pChanges ){
     for(i=0; i<pChanges->nExpr; i++){
       pList = sqlite3ExprListAppend(pParse, pList, 
           sqlite3ExprDup(db, pChanges->a[i].pExpr, 0)