File gnulib-readutmp.patch of Package coreutils

This squashes 2 consecutive upstream gnulib commits
to fix gnulib seg.faults if there is no session:

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=65617

Upstream gnulib commit 3af1d7b0ce3a8e3ae565e7cea10cee6fd7cb8109

2023-08-31  Bruno Haible  <bruno@clisp.org>

	readutmp: Fix memory leak introduced by last commit.
	* lib/readutmp.c (read_utmp_from_systemd): If num_sessions == 0 and
	sessions != NULL, do call free (sessions).

Upstream gnulib commit 1e6a26f9312bb47e070f94b17b14dc1a6ffbb74f

2023-08-30  Paul Eggert  <eggert@cs.ucla.edu>

	readutmp: fix core dump if --enable-systemd
	Problem reported by Thorsten Kukuk <https://bugs.gnu.org/65617>.
	* lib/readutmp.c (read_utmp_from_systemd):
	Don’t assume session_ptr != NULL if num_sessions == 0.
	In practice it can be null, and the man page OKs this behavior.

---
 lib/readutmp.c | 2 +-
 1 files changed, 1 insertions(+), 1 deletion(-)

diff --git a/lib/readutmp.c b/lib/readutmp.c
index 0173b7e0c1..e99158677c 100644
--- a/lib/readutmp.c
+++ b/lib/readutmp.c
@@ -795,7 +795,7 @@ read_utmp_from_systemd (idx_t *n_entries, STRUCT_UTMP **utmp_buf, int options)
     {
       char **sessions;
       int num_sessions = sd_get_sessions (&sessions);
-      if (num_sessions >= 0)
+      if (num_sessions >= 0 && sessions != NULL)
         {
           char **session_ptr;
           for (session_ptr = sessions; *session_ptr != NULL; session_ptr++)
-- 
2.42.0

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