Check correct output size in LMOTS export test

Signed-off-by: Raef Coles <raef.coles@arm.com>
diff --git a/tests/suites/test_suite_lmots.function b/tests/suites/test_suite_lmots.function
index 616c39f..b5b18b5 100644
--- a/tests/suites/test_suite_lmots.function
+++ b/tests/suites/test_suite_lmots.function
@@ -162,7 +162,7 @@
                                                    exported_pub_key_buf_size,
                                                    &exported_pub_key_size ), 0 );
 
-        TEST_EQUAL( exported_pub_key_buf_size,
+        TEST_EQUAL( exported_pub_key_size,
                     MBEDTLS_LMOTS_PUBLIC_KEY_LEN(MBEDTLS_LMOTS_SHA256_N32_W8) );
         ASSERT_COMPARE( pub_key->x, pub_key->len,
                         exported_pub_key, exported_pub_key_size );
@@ -184,7 +184,7 @@
         TEST_EQUAL( mbedtls_lmots_export_public_key( &ctx, exported_pub_key,
                                                    exported_pub_key_buf_size, NULL ),
                     0 );
-        TEST_EQUAL( exported_pub_key_buf_size,
+        TEST_EQUAL( exported_pub_key_size,
                     MBEDTLS_LMOTS_PUBLIC_KEY_LEN(MBEDTLS_LMOTS_SHA256_N32_W8) );
         ASSERT_COMPARE( pub_key->x, pub_key->len,
                         exported_pub_key, exported_pub_key_size );