Fix code style

Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
diff --git a/tests/suites/test_suite_hkdf.function b/tests/suites/test_suite_hkdf.function
index b3ccfb0..becf672 100644
--- a/tests/suites/test_suite_hkdf.function
+++ b/tests/suites/test_suite_hkdf.function
@@ -27,7 +27,7 @@
     TEST_ASSERT(ret == 0);
 
     TEST_MEMORY_COMPARE(okm, expected_okm->len,
-                   expected_okm->x, expected_okm->len);
+                        expected_okm->x, expected_okm->len);
 
 exit:
     MD_PSA_DONE();