[RFC/WIP PATCH 12/14] Fix deref of stale pointer

[Pedro Alves <pedro@codesourcery.com>]

ecs->event_thread was being referenced somewhere after
target_mourn_inferior.  I don't recall where now though...  :-P In any
case, I'm not sure this is the right fix, so I'll need to revert and
revisit.  Meanwhile, this is necessary to get things working.
---
 gdb/infrun.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/gdb/infrun.c b/gdb/infrun.c
index 6b16184..44fa074 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -4011,6 +4011,7 @@ handle_inferior_event (struct execution_control_state *ecs)
       current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer;
 
       gdb_flush (gdb_stdout);
+      ecs->event_thread = NULL;
       target_mourn_inferior ();
       singlestep_breakpoints_inserted_p = 0;
       cancel_single_step_breakpoints ();
@@ -4033,6 +4034,7 @@ handle_inferior_event (struct execution_control_state *ecs)
          target_kill() was called here, which hints that fatal signals aren't
          really fatal on some systems.  If that's true, then some changes
          may be needed.  */
+      ecs->event_thread = NULL;
       target_mourn_inferior ();
 
       print_signal_exited_reason (ecs->ws.value.sig);