sys-fs/zfs: remove unused patch

Signed-off-by: Michael Mair-Keimberger <mmk@levelnine.at>
Portage 3.0.35 / pkgdev 0.2.1 / pkgcheck 0.10.14
Closes: https://github.com/gentoo/gentoo/pull/27350
Signed-off-by: Georgy Yakovlev <gyakovlev@gentoo.org>

sys-fs/zfs/files/2.1.5-dracut-non-root.patch

@@ -1,33 +0,0 @@
-https://github.com/openzfs/zfs/pull/13589
-https://bugs.gentoo.org/854333
-
-From ef9d996669cc2ec596d4e90753b89b32a3f0ce59 Mon Sep 17 00:00:00 2001
-From: "Andrew J. Hesford" <ajh@sideband.org>
-Date: Fri, 24 Jun 2022 11:05:53 -0400
-Subject: [PATCH] Dracut module: fix parsing of root= kernel command-line
- argument
-
-Some Dracut modules may read the `root=` kernel command-line argument
-and rewrite it; in particular, `rootfs-block` installs a command-line
-hook that to canonicalize arguments that specify block devices. If the
-`zfs` module is added to an initramfs (which it is, by default, as long
-as the core ZFS utilities are available) on a system that does not use a
-ZFS root filesystem, the `zfs` module will overwrite the `root` shell
-variable with the contents of the kernel command-line in the process of
-determining if it should control mounting the root. This breaks the
-initramfs. To solve this problem, only parse the kernel command-line
-directly if the `root` shell variable is empty; otherwise, rely on the
-parsing (and possible rewriting) done by other modules.
-
-Signed-off-by: Andrew J. Hesford <ajh@sideband.org>
---- a/contrib/dracut/90zfs/zfs-lib.sh.in
-+++ b/contrib/dracut/90zfs/zfs-lib.sh.in
-@@ -88,7 +88,7 @@ decode_root_args() {
-         return
-     fi
- 
--    root=$(getarg root=)
-+    [ -n  "$root" ] || root=$(getarg root=)
-     rootfstype=$(getarg rootfstype=)
- 
-     # shellcheck disable=SC2249