[disk][darwin] fix build with latest golang.org/x/sys/unix

Fixes #958

Gopkg.lock

@@ -49,7 +49,7 @@
 
 [[projects]]
   branch = "master"
-  digest = "1:e7b553682850788c6b266faaf25218ce901558e541102d12b2998cad99f6b4fb"
+  digest = "1:0afe79d034c63eea8c5977401f5fc135394751c1213ee6c991b0c6bec44f8f60"
   name = "golang.org/x/sys"
   packages = [
     "internal/unsafeheader",
@@ -59,7 +59,7 @@
     "windows/svc/mgr",
   ]
   pruneopts = "UT"
-  revision = "76b94024e4b621e672466e8db3d7f084e7ddcad2"
+  revision = "e3ed0017c21142d3345308d92dcc7ad7020040c6"
 
 [[projects]]
   branch = "v3"

disk/disk_darwin.go

@@ -64,9 +64,9 @@ func PartitionsWithContext(ctx context.Context, all bool) ([]PartitionStat, erro
 			opts += ",nodev"
 		}
 		d := PartitionStat{
-			Device:     common.IntToString(stat.Mntfromname[:]),
-			Mountpoint: common.IntToString(stat.Mntonname[:]),
-			Fstype:     common.IntToString(stat.Fstypename[:]),
+			Device:     common.ByteToString(stat.Mntfromname[:]),
+			Mountpoint: common.ByteToString(stat.Mntonname[:]),
+			Fstype:     common.ByteToString(stat.Fstypename[:]),
 			Opts:       opts,
 		}
 		if all == false {
@@ -82,5 +82,5 @@ func PartitionsWithContext(ctx context.Context, all bool) ([]PartitionStat, erro
 }
 
 func getFsType(stat unix.Statfs_t) string {
-	return common.IntToString(stat.Fstypename[:])
+	return common.ByteToString(stat.Fstypename[:])
 }