Potential fix for code scanning alert no. 5: Incorrect allocation-error handling

[rocm-devops]

Potential fix for https://github.com/AMD-ROCm-Internal/aqlprofile/security/code-scanning/5

To fix the issue, the redundant null pointer check after new HsaTimer should be removed. Instead, the allocation failure should be handled using a try-catch block to catch the std::bad_alloc exception, which is the standard mechanism for handling allocation errors in C++. This ensures that the code adheres to C++ best practices and avoids misleading constructs.

Detailed steps:

1. Remove the null pointer check for timer_ on line 146.
2. Wrap the allocation of HsaTimer (line 144) in a try-catch block to handle the std::bad_alloc exception.
3. If an exception is caught, log or handle the error appropriately, such as setting a flag or rethrowing the exception, depending on the desired behavior.

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[ammallya]

Imported to ROCm/rocm-systems