COMPMID-2177 Fix clang warnings

Change-Id: I78039db8c58d7b14a042c41e54c25fb9cb509bf7
Signed-off-by: Michalis Spyrou <michalis.spyrou@arm.com>
Reviewed-on: https://review.mlplatform.org/c/1092
Reviewed-by: VidhyaSudhan Loganathan <vidhyasudhan.loganathan@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/tests/framework/printers/JSONPrinter.cpp b/tests/framework/printers/JSONPrinter.cpp
index 6b982f5..179cdf9 100644
--- a/tests/framework/printers/JSONPrinter.cpp
+++ b/tests/framework/printers/JSONPrinter.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2018 ARM Limited.
+ * Copyright (c) 2017-2019 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -117,7 +117,7 @@
 {
     *_stream << R"(, "list_tests" : {)";
     bool first = true;
-    for(auto info : infos)
+    for(auto const &info : infos)
     {
         if(!first)
         {