core: avoid warning in wq_wake_next()
core: avoid warning in wq_wake_next()

avoid:
core/arch/arm/kernel/wait_queue.c: In function 'wq_wake_next':
core/arch/arm/kernel/wait_queue.c:155:7: error: 'wake_read' may be used uninitialized in this function [-Werror=maybe-uninitialized]
    if (wqe->wait_read != wake_read)

When building with gcc 5.3.1

Acked-by: Jerome Forissier <ced78d268b4c9a0a20a59a9feeebd2ad90da03d3@linaro.org>
Signed-off-by: Jens Wiklander <7706914404370d7502c27a0eff493dcf491feb51@linaro.org>

pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os