fix report option Loaded error-info

[hogehuga]

What did you implement:

"vuls report" returns the following error

[vuls@testvuls vuls]$ ./vuls report -format-short-text
[Mar 30 22:59:51]  INFO [localhost] Validating config...
[Mar 30 22:59:51]  INFO [localhost] cve-dictionary: /opt/vuls/cve.sqlite3
[Mar 30 22:59:51]  INFO [localhost] Loaded: %!s(func([]string) (string, error)=0x48b470)

vuls-server (centos6.8)
=======================
Total: 0 (High:0 Medium:0 Low:0 ?:0)    0 updatable packages
...

How did you implement it:

fix L388.

How can we verify it:

I checked the operation in the environment where phenomena occurred.

Todos:

You don't have to satisfy all of the following.

• Write tests
• Write documentation
• Check that there aren't other open pull requests for the same issue/feature
• Format your source code by make fmt
• Pass the test by make test
• Provide verification config / commands
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: NO
Is it a breaking change?: NO

[kotakanbe]

Many Thanks!