core: prevent crash in tee_mmu_final() on TA loading error #2092
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If the creation of the TA execution context fails before the mapping
directives are initialized, tee_mmu_final() will be called with the TA
context field mmu being NULL.
This change allows tee_mmu_final() to be called with uninitialized
mapping resources without crashing the core.
Signed-off-by: Etienne Carriere etienne.carriere@linaro.org