d38d5862c8
Initialize `oldlen` to the size of the value, instead of leaving the value unitialized. Leaving it unitialized seems to work by accident on amd64 when running 64-bit programs, but not on i386. This matches patterns in use in other programs. PR: 237458 Approved by: emaste (mentor; implicit) MFC after: 1 week Tested on: ^/head (amd64), ^/stable/11 (i386)
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