NetworkPkg: HttpDxe sometimes free a pointer twice

NetworkPkg: HttpDxe sometimes free a pointer twice

In EfiHttpRequest, HostName was getting freed twice whenever
HttpTransmitTcp4 failed. Moved FreePool (HostName) after
HttpTransmitTcp4 call to avoid a double free.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Nagaraj Hegde <nagaraj-p.hegde@hpe.com>
Reviewed-by: Samer El-Haj-Mahmoud <elhaj@hpe.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18709 6f19259b-4bc3-4df7-8a09-765794883524