Build fixes for clang 10 (#339)

* Build fixes for clang 10

fixes build warnings in clang10

* source formatting (clang-format v11) (#340)

Co-authored-by: bwelton <bwelton@users.noreply.github.com>

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: bwelton <bwelton@users.noreply.github.com>

tests/kernel-tracing/kernel-tracing.cpp

@@ -639,7 +639,7 @@ tool_init(rocprofiler_client_finalize_t fini_func, void* tool_data)
 void
 tool_fini(void* tool_data)
 {
-    static auto _once = std::atomic_flag{ATOMIC_FLAG_INIT};
+    static std::atomic_flag _once = ATOMIC_FLAG_INIT;
     if(_once.test_and_set()) return;
 
     stop();