Remove unneccesary safety check in test

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
diff --git a/tests/suites/test_suite_psa_crypto.function b/tests/suites/test_suite_psa_crypto.function
index da39502..543b2f6 100644
--- a/tests/suites/test_suite_psa_crypto.function
+++ b/tests/suites/test_suite_psa_crypto.function
@@ -4018,8 +4018,6 @@
 
     ASSERT_ALLOC( ciphertext, ciphertext_size );
 
-    TEST_ASSERT( finish_ciphertext_size <= PSA_AEAD_FINISH_OUTPUT_MAX_SIZE );
-
     ASSERT_ALLOC( finish_ciphertext, finish_ciphertext_size );
 
     ASSERT_ALLOC( tag_buffer, tag_size );