Add errors for existing but empty dev files

Change-Id: Iad9febc50f9b8e6085f8b605249ee884d2f134d6
Signed-off-by: Galantsev, Dmitrii <dmitrii.galantsev@amd.com>


[ROCm/rocm_smi_lib commit: a4b470fe71]

projects/rocm-smi-lib/src/rocm_smi.cc

@@ -3740,6 +3740,10 @@ rsmi_dev_memory_reserved_pages_get(uint32_t dv_ind, uint32_t *num_pages,
 
   ret = GetDevValueVec(amd::smi::kDevMemPageBad, dv_ind, &val_vec);
 
+  // file is empty, which is valid for no errors
+  if (ret == RSMI_STATUS_UNEXPECTED_DATA) {
+    ret = RSMI_STATUS_SUCCESS;
+  }
   if (ret == RSMI_STATUS_FILE_ERROR) {
     return RSMI_STATUS_NOT_SUPPORTED;
   }

projects/rocm-smi-lib/src/rocm_smi_device.cc

@@ -858,8 +858,8 @@ int Device::readDevInfoMultiLineStr(DevInfoTypes type,
     ss << "Read devInfoMultiLineStr for DevInfoType ("
        << RocmSMI::devInfoTypesStrings.at(type) << ")"
        << ", but contained no string lines";
-    LOG_INFO(ss);
-    return 0;
+    LOG_ERROR(ss);
+    return ENXIO;
   }
   // Remove any *trailing* empty (whitespace) lines
   while (!retVec->empty() &&
@@ -882,6 +882,7 @@ int Device::readDevInfoMultiLineStr(DevInfoTypes type,
        << RocmSMI::devInfoTypesStrings.at(type) << ")"
        << ", but lines were empty";
     LOG_INFO(ss);
+    return ENXIO;
   }
   return 0;
 }