FreeBSD/src 47c347c (r346539)lib/libc/tests/sys sendfile_test.c

Fix `get_int_via_sysctlbyname(..)` on Jenkins

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)
DeltaFile
+2-0lib/libc/tests/sys/sendfile_test.c
+2-01 files

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