Github issue#52 fix

Change-Id: I35b56980a918bf2582fc4c283b9f60f8512a39d0


[ROCm/rocprofiler commit: 865e64753a]

projects/rocprofiler/doc/ROCProfiler_V1_API_spec.md

@@ -75,7 +75,7 @@ Library version:
 ```
 ### 3.2. Returning the error and error string methods
 ```
-const char* rocprofiler_error_string();
+hsa_status_t rocprofiler_error_string(const char** str);
 ```
 ### 3.3. Library version
 ```