Return NOT_SUPPORTED if fail to write to sysfs

Check the error and return NOT_SUPPORTED when write to sysfs.

Change-Id: Idaa91816197413643552e230a483b79500d44e08

rocm_smi/src/rocm_smi_utils.cc

@@ -120,6 +120,9 @@ int WriteSysfsStr(std::string path, std::string val) {
 
   fs << val;
   fs.close();
+  if (!fs) {
+    return ENOENT;  // Map to NOT_SUPPORT if errors
+  }
   return ret;
 }