Fix copypasta

Author: gilles-peskine-arm

library/psa_crypto.c

@@ -1433,7 +1433,7 @@ psa_status_t psa_export_public_key( psa_key_handle_t handle,
 static_assert( ( MBEDTLS_PSA_KA_MASK_EXTERNAL_ONLY & MBEDTLS_PSA_KA_MASK_DUAL_USE ) == 0,
                "One or more key attribute flag is listed as both external-only and dual-use" );
 static_assert( ( PSA_KA_MASK_INTERNAL_ONLY & MBEDTLS_PSA_KA_MASK_DUAL_USE ) == 0,
-               "One or more key attribute flag is listed as both external-only and dual-use" );
+               "One or more key attribute flag is listed as both internal-only and dual-use" );
 static_assert( ( PSA_KA_MASK_INTERNAL_ONLY & MBEDTLS_PSA_KA_MASK_EXTERNAL_ONLY ) == 0,
                "One or more key attribute flag is listed as both internal-only and external-only" );
 #endif