additional error check

main.go

@@ -31,7 +31,7 @@ func main() {
 
 	c := &command{flattener: rootfs.Flatten, Stdout: os.Stdout}
 	if err := c.execute(os.Args[1], os.Args[2]); err != nil {
-		fmt.Printf("Error: %v", err)
+		fmt.Printf("Error: %v\n", err)
 		os.Exit(1)
 	}
 	os.Exit(0)

rootfs/rootfs.go

@@ -52,6 +52,9 @@ func Flatten(rd io.ReadSeeker, w io.Writer) (_err error) {
 		if err == io.EOF {
 			break
 		}
+		if err != nil {
+			return err
+		}
 		if hdr.Typeflag != tar.TypeReg {
 			continue
 		}