amdgpu: don't try to open paths that don't exist

src/overlay.cpp

@@ -876,6 +876,7 @@ void init_gpu_stats(uint32_t& vendorID, uint32_t reported_deviceID, overlay_para
             amdgpu.gtt_used = fopen((device_path + "/mem_info_gtt_used").c_str(), "r");
 
          const std::string hwmon_path = device_path + "/hwmon/";
+         if (fs::exists(hwmon_path)){
             const auto dirs = ls(hwmon_path.c_str(), "hwmon", LS_DIRS);
             for (const auto& dir : dirs) {
                if (!amdgpu.temp)
@@ -889,6 +890,7 @@ void init_gpu_stats(uint32_t& vendorID, uint32_t reported_deviceID, overlay_para
                if (!amdgpu.gpu_voltage_soc)
                   amdgpu.gpu_voltage_soc = fopen((hwmon_path + dir + "/in0_input").c_str(), "r");
             }
+         }
 
          if (!metrics_path.empty())
             break;