null tcon is not likely in these paths in current
code, but obviously it does clarify the code to
check for null (if at all) before derefrencing
rather than after.

Reported by Coverity (CID 1042666)
Signed-off-by: NSteve French <smfrench@gmail.com>
Acked-by: NShirish Pargaonkar <shirishpargaonkar@gmail.com>
Acked-by: NSachin Prabhu <sprabhu@redhat.com>