exfat 1.2.1 -> 1.2.2

Changes:
- Improved reliability in case of a sudden unplug: FS will be in a clean
  state after closing all files and performing sync(1).
- Fixed compilation on Debian GNU/kFreeBSD and GNU/Hurd platforms.
- Updated mount.exfat-fuse man page.

pkgs/tools/filesystems/exfat/default.nix

@@ -1,11 +1,11 @@
 { stdenv, fetchFromGitHub, autoreconfHook, pkgconfig, fuse }:
 
-let version = "1.2.1"; in
+let version = "1.2.2"; in
 stdenv.mkDerivation rec {
   name = "exfat-${version}";
 
   src = fetchFromGitHub {
-    sha256 = "1k716civkxszkzpc7bcqqcmfik8lpwk3zwp2nl4v844b8g7r5xz9";
+    sha256 = "17yyd988l4r5w3q3h3hjlxprbw74wdg4n759lzg325smh96qk7p1";
     rev = "v${version}";
     repo = "exfat";
     owner = "relan";