go-mtpfs: switch to fetchFromGitHub

pkgs/tools/filesystems/go-mtpfs/default.nix

@@ -1,20 +1,20 @@
-{ pkg-config, libusb1, buildGoPackage, fetchgit }:
+{ pkg-config, libusb1, buildGoPackage, fetchFromGitHub }:
 
 buildGoPackage rec {
   pname = "go-mtpfs";
-  version = "2018-02-09";
-  rev = "d6f8f3c05ce0ed31435057ec342268a0735863bb";
+  version = "unstable-2018-02-09";
 
   goPackagePath = "github.com/hanwen/go-mtpfs";
 
+  src = fetchFromGitHub {
+    owner = "hanwen";
+    repo = "go-mtpfs";
+    rev = "d6f8f3c05ce0ed31435057ec342268a0735863bb";
+    sha256 = "sha256-sz+ikhZGwSIAI2YBSQKURF3WXB8dHgQ/C/dbkXwrDSg=";
+  };
+
   nativeBuildInputs = [ pkg-config ];
   buildInputs = [ libusb1 ];
 
-  src = fetchgit {
-    inherit rev;
-    url = "https://github.com/hanwen/go-mtpfs";
-    sha256 = "0a0d5dy92nzp1czh87hx3xfdcpa4jh14j0b64c025ha62s9a4gxk";
-  };
-
   goDeps = ./deps.nix;
 }