[otbn] Make run_smoke.sh throw error in a mismatch
[otbn] Make run_smoke.sh throw error in a mismatch

Ensures that if the produced smoke test output is not matching
the expected output, it will get implied in the error message

Signed-off-by: Canberk Topal <e6b05429a51cc3258c31cb1f7836595b60921a29@lowrisc.org>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan