Check returned error values

Signed-off-by: Evan Lezar <elezar@nvidia.com>

pkg/nvcdi/driver-nvml.go

@@ -36,7 +36,11 @@ func NewDriverDiscoverer(logger logger.Interface, driverRoot string, nvidiaCTKPa
 	if r := nvmllib.Init(); r != nvml.SUCCESS {
 		return nil, fmt.Errorf("failed to initialize NVML: %v", r)
 	}
-	defer nvmllib.Shutdown()
+	defer func() {
+		if r := nvmllib.Shutdown(); r != nvml.SUCCESS {
+			logger.Warningf("failed to shutdown NVML: %v", r)
+		}
+	}()
 
 	version, r := nvmllib.SystemGetDriverVersion()
 	if r != nvml.SUCCESS {

pkg/nvcdi/driver-wsl.go

@@ -43,7 +43,11 @@ func newWSLDriverDiscoverer(logger logger.Interface, driverRoot string, nvidiaCT
 	if err != nil {
 		return nil, fmt.Errorf("failed to initialize dxcore: %v", err)
 	}
-	defer dxcore.Shutdown()
+	defer func() {
+		if err := dxcore.Shutdown(); err != nil {
+			logger.Warningf("failed to shutdown dxcore: %v", err)
+		}
+	}()
 
 	driverStorePaths := dxcore.GetDriverStorePaths()
 	if len(driverStorePaths) == 0 {

pkg/nvcdi/lib-nvml.go

@@ -43,7 +43,11 @@ func (l *nvmllib) GetAllDeviceSpecs() ([]specs.Device, error) {
 	if r := l.nvmllib.Init(); r != nvml.SUCCESS {
 		return nil, fmt.Errorf("failed to initialize NVML: %v", r)
 	}
-	defer l.nvmllib.Shutdown()
+	defer func() {
+		if r := l.nvmllib.Shutdown(); r != nvml.SUCCESS {
+			l.logger.Warningf("failed to shutdown NVML: %v", r)
+		}
+	}()
 
 	gpuDeviceSpecs, err := l.getGPUDeviceSpecs()
 	if err != nil {

pkg/nvcdi/lib.go

@@ -191,7 +191,11 @@ func (l *nvcdilib) getCudaVersion() (string, error) {
 	if r != nvml.SUCCESS {
 		return "", fmt.Errorf("failed to initialize nvml: %v", r)
 	}
-	defer l.nvmllib.Shutdown()
+	defer func() {
+		if r := l.nvmllib.Shutdown(); r != nvml.SUCCESS {
+			l.logger.Warningf("failed to shutdown NVML: %v", r)
+		}
+	}()
 
 	version, r := l.nvmllib.SystemGetDriverVersion()
 	if r != nvml.SUCCESS {