Check to force tools to initialize the ctx id to zero. (#1135)

* Check to force tool to initialize the ctx id to zero.

* initialize rocprofiler_context_id_t with 0 in units tests

* changelog

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Co-authored-by: Gopesh Bhardwaj <gopesh.bhardwaj@amd.com>

samples/pc_sampling/client.cpp

@@ -62,7 +62,7 @@ namespace
 {
 rocprofiler_client_id_t*      client_id        = nullptr;
 rocprofiler_client_finalize_t client_fini_func = nullptr;
-rocprofiler_context_id_t      client_ctx;
+rocprofiler_context_id_t      client_ctx{0};
 
 int
 tool_init(rocprofiler_client_finalize_t fini_func, void* /*tool_data*/)