PW.SET_BUT_NOT_USED

Defect 114156 (STATIC_C)
Checker PW.SET_BUT_NOT_USED (subcategory none)
File: /test/format/backup.c
Parse Warning (no function name available)
/test/format/backup.c, line: 220
variable "ret" was set but never used

        WT_DECL_RET;