cp failing due to identical files is still counted as a failure

[Tsaukpaetra]

Describe the bug
I did a silly and configured a destination location to be the same as its original location (i.e. DOMAIN_KEY_LOCATION="/root/.getssl/domain.com/domain.com.key")

which resulted in this as an apparently fatal error:

copying private key to /root/.getssl/domain.com/domain.com.key
cp: /root/.getssl/domain.com/domain.com.key and /root/.getssl/domain.com/domain.com.key are identical (not copied).
getssl: cannot copy /root/.getssl/domain.com/domain.com.key to /root/.getssl/domain.com/domain.com.key

Traceback

 main() line 3189 called

  cert_install() line 431 called

   copy_file_to_location() line 1108 called

    error_exit() line 1301 called traceback

To Reproduce
Set a location for the key/cert/whatever to the same location as it is already in.

Expected behavior
Probably a catch warning for cp when it emits that specific error and note that the file wasn't updated.

Operating system (please complete the following information):

• OS: FreeBSD namp 13.1-RELEASE-p7 FreeBSD 13.1-RELEASE-p7 n245428-4dfb91682c1 TRUENAS amd64
• Bash Version tcsh 6.21.00 (Astron) 2019-05-08 (x86_64-amd-FreeBSD) options wide,nls,dl,al,kan,sm,rh,color,filec

Additional context
Just noticed that a renewal was failing and had time to troubleshoot it properly today. I think I originally made the mistake when troubleshooting scp auto-login issues and just never actually checked if it was working to the end of the process.
Lowest priority. Just wanted to share my mirth when I realized I made a stupid happen. :)