user_ta: tee_ta_init_user_ta_session(): return if calloc fails
user_ta: tee_ta_init_user_ta_session(): return if calloc fails

There is no sense to do cleanup if user TA context can't be
allocated. Return error immediately.

Signed-off-by: Volodymyr Babchuk <07adff7e050dc3230ac0b7d9c296bbb62f4ecc95@gmail.com>
Reviewed-by: Jerome Forissier <ced78d268b4c9a0a20a59a9feeebd2ad90da03d3@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