[PATCH] gdb: use correct target in notify_thread_exited()

[Markus Metzger <markus.t.metzger@intel.com>]

clean_up_just_stopped_threads_fsms() may call notify_thread_exited() in
the context of a thread from a different target.  In my case:

    at .../gdb/thread.c:404
    exit_code=std::optional [no contained value], silent=false)
    at .../gdb/thread.c:436
    exit_code=std::optional [no contained value], silent=false)
    at .../gdb/thread.c:733
    at .../gdb/thread.c:763
    at .../gdb/infrun.c:4548
    at .../gdb/infrun.c:4786

Instead of relying on global state, use the exited thread's inferior's
target, which is exactly the target we want.
---
 gdb/thread.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/gdb/thread.c b/gdb/thread.c
index 74124596b28..5c3b60b2aa7 100644
--- a/gdb/thread.c
+++ b/gdb/thread.c
@@ -203,14 +203,16 @@ notify_thread_exited (thread_info *t, std::optional<ULONGEST> exit_code,
 {
   if (!silent && print_thread_events)
     {
+      struct target_ops *target = t->inf->top_target ();
+
       if (exit_code.has_value ())
 	gdb_printf (_("[%s (id %s) exited with code %s]\n"),
-		    target_pid_to_str (t->ptid).c_str (),
+		    target->pid_to_str (t->ptid).c_str (),
 		    print_thread_id (t),
 		    pulongest (*exit_code));
       else
 	gdb_printf (_("[%s (id %s) exited]\n"),
-		    target_pid_to_str (t->ptid).c_str (),
+		    target->pid_to_str (t->ptid).c_str (),
 		    print_thread_id (t));
     }
 
-- 
2.34.1

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