...when checking a package. This will give more relevant information
than before, removes a message that is misleading in many cases, and
allows for some minor simplification.
before:
```
$ doas xbps-pkgdb runit-void; echo $?
ERROR: runit-void: hash mismatch for /etc/runit/2.
ERROR: runit-void: files check FAILED.
Failed to check `runit-void': Operation not permitted
1
```
after:
```
$ doas xbps-pkgdb runit-void; echo $?
ERROR: runit-void: hash mismatch for /etc/runit/2.
ERROR: runit-void: files check FAILED.
1
```
this does not change the behaviour of `xbps-pkgdb -a`
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