Revert "ecryptfs: fix kernel bug introduced in 4.4.14"

The Linux 4.4.17 release fixes the underlying issue

This reverts commit fad9a8841b.

pkgs/os-specific/linux/kernel/ecryptfs-fix-mmap-bug.patch

@@ -1,20 +0,0 @@
-Signed-off-by: Tyler Hicks <tyhicks@xxxxxxxxxxxxx>
-Tested-by: Tyler Hicks <tyhicks@xxxxxxxxxxxxx> # 4.4.y, 3.18.y
-Cc: <stable@xxxxxxxxxxxxxxx> # 4.5-
----
- fs/ecryptfs/kthread.c | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
-diff --git a/fs/ecryptfs/kthread.c b/fs/ecryptfs/kthread.c
-index e818f5a..b9faeab 100644
---- a/fs/ecryptfs/kthread.c
-+++ b/fs/ecryptfs/kthread.c
-@@ -171,7 +171,7 @@ int ecryptfs_privileged_open(struct file **lower_file,
- 		goto out;
- 	}
- have_file:
--	if ((*lower_file)->f_op->mmap == NULL) {
-+	if ((*lower_file)->f_op->mmap == NULL && !d_is_dir(lower_dentry)) {
- 		fput(*lower_file);
- 		*lower_file = NULL;
- 		rc = -EMEDIUMTYPE;

pkgs/os-specific/linux/kernel/patches.nix

@@ -148,8 +148,4 @@ rec {
         sha256 = "14rm1qr87p7a5prz8g5fwbpxzdp3ighj095x8rvhm8csm20wspyy";
       };
     };
-  ecryptfs_fix_mmap_bug =
-    { name = "ecryptfs_fix_mmap_bug";
-      patch = ./ecryptfs-fix-mmap-bug.patch;
-    };
 }

pkgs/top-level/all-packages.nix

@@ -11130,7 +11130,6 @@ in
   linux_4_4 = callPackage ../os-specific/linux/kernel/linux-4.4.nix {
     kernelPatches =
       [ kernelPatches.bridge_stp_helper
-        kernelPatches.ecryptfs_fix_mmap_bug
       ]
       ++ lib.optionals ((platform.kernelArch or null) == "mips")
       [ kernelPatches.mips_fpureg_emu