repo-updater: use proper nil check for info.CloneTime
Created by: ggilmore
https://github.com/sourcegraph/sourcegraph/commit/68b1d86ccc16b758b3595c0a54deb8a2d010fa9a introduced a regression caused the info.CloneTime
pointer to be dereferenced before checking to see if was nil
on the following line. This caused panics in production.
This PR swaps the order of the nil check and the pointer deference - which should alleviate this issue.