Delete unused patch

libmount-unref.patch

@@ -1,43 +0,0 @@
-From 4c3ef23b59c870281a75424c74ec0b6b5a4ae5e8 Mon Sep 17 00:00:00 2001
-From: Colin Walters <walters@verbum.org>
-Date: Thu, 23 Feb 2017 09:40:17 -0500
-Subject: [PATCH] deploy: Correctly use libmount unref() calls rather than
- free()
-
-We saw a random ostree SEGV start popping up in our CI environment:
-https://github.com/projectatomic/rpm-ostree/pull/641#issuecomment-281870424
-
-Looking at this code more and comparing it to what util-linux does, I noticed we
-had a write-after-free, since `mnt_unref_table()` will invoke
-`mnt_unref_cache()` on its cache, and that function does:
-
-```
-	if (cache) {
-		cache->rfcount--;
-```
-
-unconditionally.
-
-Fix this by using `unref()`.
----
- src/libostree/ostree-sysroot-deploy.c | 4 ++--
- 1 file changed, 2 insertions(+), 2 deletions(-)
-
-diff --git a/src/libostree/ostree-sysroot-deploy.c b/src/libostree/ostree-sysroot-deploy.c
-index cb5a461..5a3f6d8 100644
---- a/src/libostree/ostree-sysroot-deploy.c
-+++ b/src/libostree/ostree-sysroot-deploy.c
-@@ -1692,8 +1692,8 @@ is_ro_mount (const char *path)
- 
-   fs = mnt_table_find_target(tb, path, MNT_ITER_BACKWARD);
-   is_mount = fs && mnt_fs_get_target (fs);
--  mnt_free_cache (cache);
--  mnt_free_table (tb);
-+  mnt_unref_cache (cache);
-+  mnt_unref_table (tb);
- 
-   if (!is_mount)
-     return FALSE;
--- 
-2.9.3
-