Test always evaluates the same

Defect 114043 (STATIC_C)
Checker DEADCODE (subcategory redundant_test)
File: /src/include/btree.i
Function __wt_bt_col_var_cursor_walk_txn_read
/src/include/btree.i, line: 1745
At condition "upd != NULL", the value of "upd" cannot be "NULL".

        if (upd != NULL && upd->type == WT_UPDATE_TOMBSTONE) {

/src/include/btree.i, line: 1743
Condition "upd == NULL", taking false branch. Now the value of "upd" is not "NULL".

        if (upd == NULL)

/src/include/btree.i, line: 1745
The condition "upd != NULL" must be true.

        if (upd != NULL && upd->type == WT_UPDATE_TOMBSTONE) {