Until we determine whether we should dip into the connection

Until we determine whether we should dip into the connection
pool each time, rearrange the logic to avoid a double
check which is unneeded. No matter what (if it's reusable or
not) a null conn->hostname needs to be set. At that
point it doesn't matter if we're not reusing it or
if the string comparison happens, since what we
would do in that case has already been done.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@350250 13f79535-47bb-0310-9956-ffa450edef68