virtcontainers: Convert stats dev_t to uint64

We need to convert them to uint64 as their types may differ on various
host OSes, but unix.Major|Minor takes a uint64 regardless.

Signed-off-by: Samuel Ortiz <s.ortiz@apple.com>

src/runtime/virtcontainers/mount.go

@@ -144,8 +144,8 @@ func getDeviceForPath(path string) (device, error) {
 
 	if isHostDevice(path) {
 		// stat.Rdev describes the device that this file (inode) represents.
-		devMajor = major(stat.Rdev)
-		devMinor = minor(stat.Rdev)
+		devMajor = major(uint64(stat.Rdev))
+		devMinor = minor(uint64(stat.Rdev))
 
 		return device{
 			major:      devMajor,
@@ -154,8 +154,8 @@ func getDeviceForPath(path string) (device, error) {
 		}, nil
 	}
 	// stat.Dev points to the underlying device containing the file
-	devMajor = major(stat.Dev)
-	devMinor = minor(stat.Dev)
+	devMajor = major(uint64(stat.Dev))
+	devMinor = minor(uint64(stat.Dev))
 
 	path, err = filepath.Abs(path)
 	if err != nil {