Corrects mistake from encrypt setup test

This commit alters an ASSERT_COMPARE statement
at the end of the aead_encrypt_setup test. This is to
correct a mistake introduced by the preceding PR.

Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
diff --git a/tests/suites/test_suite_psa_crypto_driver_wrappers.function b/tests/suites/test_suite_psa_crypto_driver_wrappers.function
index 0484646..e642ec7 100644
--- a/tests/suites/test_suite_psa_crypto_driver_wrappers.function
+++ b/tests/suites/test_suite_psa_crypto_driver_wrappers.function
@@ -2432,9 +2432,7 @@
 
         /* Compare output_data and expected_ciphertext */
         ASSERT_COMPARE( expected_ciphertext->x, expected_ciphertext->len,
-                        output_data, output_length );
-
-        TEST_EQUAL( output_length + finish_output_length, expected_ciphertext->len );
+                        output_data, output_length + finish_output_length );
 
         /* Compare tag and expected_tag */
         ASSERT_COMPARE( expected_tag->x, expected_tag->len, tag_buffer, tag_length );