Suppress "rsmi_init() failed" error message

When an application call the library in a system without amdgpu,
it may always print out "rsmi_init() failed". Suppress the error
message in the library.

Change-Id: Ice63dd3a764b221a6935536bff1bfa6aa3e51a46

src/rocm_smi.cc

@@ -436,7 +436,6 @@ rsmi_init(uint64_t flags) {
       smi.Initialize(flags);
     } catch(...) {
       smi.Cleanup();
-      std::cerr << "rsmi_init() failed" << std::endl;
       throw amd::smi::rsmi_exception(RSMI_STATUS_INIT_ERROR, __FUNCTION__);
     }
   }