fixed clang-tidy errors

fixed clang compilation error and few clang-tidy issues

Tested:
- Code compiles, all unit tests are passing
- Number of reported clang-tidy issues decreased

Change-Id: Ie3f88db6e2dffb26ec6c56dbdc1ce5bad288dccd
Signed-off-by: Krzysztof Grobelny <krzysztof.grobelny@intel.com>
diff --git a/src/utils/circular_vector.hpp b/src/utils/circular_vector.hpp
index 55d3f29..ba185ec 100644
--- a/src/utils/circular_vector.hpp
+++ b/src/utils/circular_vector.hpp
@@ -4,7 +4,7 @@
 class CircularVector
 {
   public:
-    CircularVector(size_t maxSizeIn) : maxSize(maxSizeIn)
+    explicit CircularVector(size_t maxSizeIn) : maxSize(maxSizeIn)
     {}
 
     template <class... Args>