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The struct psa_cipher_operation_s is built with a mbedtls_cipher_context_t. The shape of mbedtls_cipher_context_t and an initializer that works with Clang 5.0 and its -Wmissing-field-initializers varies based on the configuration of the library. Instead of making multiple initializers based on a maze of ifdefs for all combinations of MBEDTLS_CIPHER_MODE_WITH_PADDING, MBEDTLS_CMAC_C, and MBEDTLS_USE_PSA_CRYPTO, add a dummy variable to psa_cipher_operation_s's union that encloses mbedtls_cipher_context_t. This allows us to initialize the dummy with a Clang-approved initializer and have it properly initialize the entire object.