Fix crash with erlang:system_info({cpu_topology,junk})

[Paul Guyot]

Hello,

There is a bug causing a crash if erlang:system_info is called with {cpu_topology, Atom} where Atom is an unrecognized Atom (e.g. misspelled). The function should fail with badarg, but the emulator would segfault instead.

A fix with a non-regression test is available here:
git fetch git://github.com/pguyot/otp.git fix-system_info-cpu_topology-segfault

Paul
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