COMPMID-418 Add check and fix comments after preprocessor conditions

Change-Id: I1353fd652ee180e3931e58b4ce13d651a48c7e2c
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/79567
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Moritz Pflanzer <moritz.pflanzer@arm.com>
diff --git a/tests/Utils.h b/tests/Utils.h
index 8d5046d..ad45bff 100644
--- a/tests/Utils.h
+++ b/tests/Utils.h
@@ -40,9 +40,9 @@
 #include <string>
 #include <type_traits>
 
-#if ARM_COMPUTE_ENABLE_FP16
+#ifdef ARM_COMPUTE_ENABLE_FP16
 #include <arm_fp16.h> // needed for float16_t
-#endif
+#endif                /* ARM_COMPUTE_ENABLE_FP16 */
 
 namespace arm_compute
 {
@@ -102,7 +102,7 @@
 template <> struct promote<float> { using type = float; };
 #ifdef ARM_COMPUTE_ENABLE_FP16
 template <> struct promote<float16_t> { using type = float16_t; };
-#endif
+#endif /* ARM_COMPUTE_ENABLE_FP16 */
 
 
 template <typename T>
@@ -417,4 +417,4 @@
 }
 } // namespace test
 } // namespace arm_compute
-#endif
+#endif /* __ARM_COMPUTE_TEST_UTILS_H__ */