fix issues found by nilness

The conditions are always true so they can be removed. And in the case
of exportCheckpoint() the scope means addToTarFiles was overwritten and
thus when it looped over it later the slice was always empty.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

cmd/podman/volumes/prune.go

@@ -64,9 +64,6 @@ func prune(cmd *cobra.Command, args []string) error {
 	if !force {
 		reader := bufio.NewReader(os.Stdin)
 		fmt.Println("WARNING! This will remove all volumes not used by at least one container. The following volumes will be removed:")
-		if err != nil {
-			return err
-		}
 		listOptions.Filter, err = parse.FilterArgumentsIntoFilters(filter)
 		if err != nil {
 			return err

libpod/container_internal_common.go

@@ -901,25 +901,19 @@ func (c *Container) resolveWorkDir() error {
 	if !c.config.CreateWorkingDir {
 		// No need to create it (e.g., `--workdir=/foo`), so let's make sure
 		// the path exists on the container.
-		if err != nil {
-			if os.IsNotExist(err) {
-				// If resolved Workdir path gets marked as a valid symlink,
-				// return nil cause this is valid use-case.
-				if c.isWorkDirSymlink(resolvedWorkdir) {
-					return nil
-				}
-				return fmt.Errorf("workdir %q does not exist on container %s", workdir, c.ID())
+		if errors.Is(err, os.ErrNotExist) {
+			// If resolved Workdir path gets marked as a valid symlink,
+			// return nil cause this is valid use-case.
+			if c.isWorkDirSymlink(resolvedWorkdir) {
+				return nil
 			}
-			// This might be a serious error (e.g., permission), so
-			// we need to return the full error.
-			return fmt.Errorf("detecting workdir %q on container %s: %w", workdir, c.ID(), err)
+			return fmt.Errorf("workdir %q does not exist on container %s", workdir, c.ID())
 		}
-		return nil
+		// This might be a serious error (e.g., permission), so
+		// we need to return the full error.
+		return fmt.Errorf("detecting workdir %q on container %s: %w", workdir, c.ID(), err)
 	}
 	if err := os.MkdirAll(resolvedWorkdir, 0755); err != nil {
-		if os.IsExist(err) {
-			return nil
-		}
 		return fmt.Errorf("creating container %s workdir: %w", c.ID(), err)
 	}
 
@@ -1192,7 +1186,7 @@ func (c *Container) exportCheckpoint(options ContainerCheckpointOptions) error {
 			return fmt.Errorf("exporting root file-system diff for %q: %w", c.ID(), err)
 		}
 
-		addToTarFiles, err := crutils.CRCreateRootFsDiffTar(&rootFsChanges, c.state.Mountpoint, c.bundlePath())
+		addToTarFiles, err = crutils.CRCreateRootFsDiffTar(&rootFsChanges, c.state.Mountpoint, c.bundlePath())
 		if err != nil {
 			return err
 		}

libpod/runtime_pod_common.go

@@ -90,11 +90,7 @@ func (r *Runtime) NewPod(ctx context.Context, p specgen.PodSpecGenerator, option
 			break
 		}
 	}
-	if addPodErr != nil {
-		return nil, fmt.Errorf("adding pod to state: %w", addPodErr)
-	}
-
-	return pod, nil
+	return nil, fmt.Errorf("adding pod to state: %w", addPodErr)
 }
 
 // AddInfra adds the created infra container to the pod state

pkg/domain/infra/abi/images.go

@@ -785,7 +785,7 @@ func (ir *ImageEngine) Scp(ctx context.Context, src, dst string, opts entities.I
 	if err != nil {
 		return nil, err
 	}
-	if (report.LoadReport == nil && err == nil) && (report.Source != nil && report.Dest != nil) { // we need to execute the transfer
+	if report.LoadReport == nil && (report.Source != nil && report.Dest != nil) { // we need to execute the transfer
 		transferOpts := entities.ScpTransferOptions{}
 		transferOpts.ParentFlags = report.ParentFlags
 		_, err := Transfer(ctx, *report.Source, *report.Dest, transferOpts)

pkg/machine/ocipull/source.go

@@ -35,9 +35,6 @@ func GetLocalBlob(ctx context.Context, path string) (*types.BlobInfo, error) {
 		return nil, err
 	}
 	blobs := img.LayerInfos()
-	if err != nil {
-		return nil, err
-	}
 	if len(blobs) != 1 {
 		return nil, errors.New("invalid disk image")
 	}