USB: HSIC SMSC HUB: Fix the bug in enabling the hub

Return statement is missing after enabling the hub successfully.
This is causing the control to enter error path and the hub is
disabled.

Change-Id: Ideb65a1826f2679ae5b941101685c97439e1e216
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>