winedbg: stack_backtrace should not return a value

[Austin English]

-- 
-Austin
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diff --git a/programs/winedbg/stack.c b/programs/winedbg/stack.c
index 74dcc40..f49480a 100644
--- a/programs/winedbg/stack.c
+++ b/programs/winedbg/stack.c
@@ -447,7 +447,11 @@ void stack_backtrace(DWORD tid)
     /* backtrace every thread in every process except the debugger itself,
      * invoking via "bt all"
      */
-    if (tid == -1) return backtrace_all();
+    if (tid == -1)
+    {
+        backtrace_all();
+        return;
+    }
 
     if (!dbg_curr_process) 
     {