Coverity analysis defect 126331: Uninitialized pointer read

Uninitialized pointer read

Incorrect values could be read from, or even written to, an arbitrary memory location, causing incorrect computations. Reads an uninitialized pointer or its target
/src/schema/schema_rename.c:95: UNINIT 126331 Declaring variable "cval" without initializer.
/src/schema/schema_rename.c:154: UNINIT 126331 Using uninitialized value "cval.str" when calling "__wt_buf_fmt".