Alexandre Julliard : winedbg: Avoid a crash when there' s no backtrace to print.

[Alexandre Julliard]

Module: wine
Branch: refs/heads/master
Commit: d47dcbf05a0159a87234ac6e41ae011150019f09
URL:    http://source.winehq.org/git/?p=wine.git;a=commit;h=d47dcbf05a0159a87234ac6e41ae011150019f09

Author: Alexandre Julliard <julliard at winehq.org>
Date:   Thu Jun 15 11:38:43 2006 +0200

winedbg: Avoid a crash when there's no backtrace to print.

---

 programs/winedbg/stack.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/programs/winedbg/stack.c b/programs/winedbg/stack.c
index 10879ef..b976117 100644
--- a/programs/winedbg/stack.c
+++ b/programs/winedbg/stack.c
@@ -283,6 +283,7 @@ static void backtrace(void)
     }
     /* reset context to current stack frame */
     dbg_curr_thread->curr_frame = cf;
+    if (!dbg_curr_thread->frames) return;
     stack_get_frame(dbg_curr_thread->curr_frame, &ihsf);
     SymSetContext(dbg_curr_process->handle, &ihsf, NULL);
 }