Coverity 1374542: Dereference after null check

1188         */

    	8. Condition start == NULL, taking true branch

1189        if (start == NULL) {

CID 1374542 (#1 of 1): Dereference after null check (FORWARD_NULL)

9. var_deref_op: Dereferencing null pointer stop.

1190                WT_ERR(__session_open_cursor(

1191                    (WT_SESSION *)session, stop->uri, NULL, NULL, &start));

1192                local_start = true;

    	CID 1357531: Explicit null dereferenced (FORWARD_NULL) [select issue]

1193                WT_ERR(start->next(start));

1194        }