[coreboot-gerrit] Change in coreboot[master]: util/msrtool: Exit program after displaying the help message

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Change subject: util/msrtool: Exit program after displaying the help message
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Patch Set 4: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/59009/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/14352/ : SUCCESS