plugins/chksum: use exit instead of return #1573
Merged
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From https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_24:
| The return utility shall cause the shell to stop executing the current
| function or dot script. If the shell is not currently executing a
| function or dot script, the results are unspecified.
Closes: #1572