Coverity/lint cleanup

677        /* Adjust the root's memory footprint and mark it dirty. */

678        __wt_cache_page_inmem_incr(session, root, root_incr);

679        __wt_cache_page_inmem_decr(session, root, root_decr);

680        __wt_page_modify_set(session, root);

681

   	intervals: When switching on complete, the value of complete must be in one of the following intervals: {[0,0], [2,2]}.

682err:    switch (complete) {

683        case WT_ERR_RETURN:

684                __wt_free_ref_index(session, root, alloc_index, true);

685                break;

   	dead_error_condition: The switch value complete cannot be WT_ERR_PANIC.

	CID 1371132 (#1 of 1): Logically dead code (DEADCODE)

	dead_error_begin: Execution cannot reach this statement: case WT_ERR_PANIC:.

686        case WT_ERR_PANIC:

687                __wt_err(session, ret,

688                    "fatal error during root page split to deepen the tree");

689                ret = WT_PANIC;

690                break;

691        case WT_ERR_IGNORE:

692                if (ret != 0 && ret != WT_PANIC) {

693                        __wt_err(session, ret,

694                            "ignoring not-fatal error during root page split "

695                            "to deepen the tree");

696                        ret = 0;

697                }

698                break;

699        }

700        return (ret);