staging: vchiq_core: Bailout if VCHIQ state is already initialized

In case VCHIQ state is already initialized we need to bailout
in order to aovid a memory leak.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>