tee: qcomtee: add missing va_end in early return qcomtee_object_user_init()

tee: qcomtee: add missing va_end in early return qcomtee_object_user_init()

qcomtee_object_user_init() is a variadic function and when the function
return because there's no dispatch callback in QCOMTEE_OBJECT_TYPE_CB
case, there's no va_end to cleanup "ap" object initialized by va_start
and that can cause undefined behavior. So make sure to use va_end before
returning the error code when there's no dispatch callback.

This is reported by Coverity Scan as "Missing varargs init or cleanup".

Fixes: d6e290837e50 ("tee: add Qualcomm TEE driver")
Signed-off-by: Robertus Diawan Chris <robertusdchris@gmail.com>
Reviewed-by: Amirreza Zarrabi <amirreza.zarrabi@oss.qualcomm.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>