[3.13] gh-139146: Check `calloc()` results in `_testembed.c::test_pre_initialization_sys_options` (GH-139147) (#139414)

gh-139146: Check `calloc()` results in `_testembed.c::test_pre_initialization_sys_options` (GH-139147)
(cherry picked from commit 9c6a1f847b648747414600f2cde18f3837505537)


Reported by: Dmitrii Chuprov <cheese@altlinux.org>

Signed-off-by: Denis Sergeev <zeff@altlinux.org>
Co-authored-by: Denis Sergeev <zeff@altlinux.org>