Don't include a backtrace if there is none to be had.

1 files changed, 10 insertions, 7 deletions

diff --git a/hurd/trace.h b/hurd/trace.h
index c566e9f..4b6ad89 100644
--- a/hurd/trace.h
+++ b/hurd/trace.h
@@ -109,15 +109,18 @@ trace_buffer_add (const char *func, const int lineno,
       buffer->count = backtrace (buffer->bt,
 				 (sizeof (buffer->bt)
 				  / sizeof (buffer->bt[0])));
-      int i;
-      pc (' '); pc ('(');
-      for (i = 0; i < buffer->count; i ++)
+      if (buffer->count > 0)
 	{
-	  s_cprintf (pc, "%x", buffer->bt[i]);
-	  if (i != buffer->count - 1)
-	    pc (' ');
+	  int i;
+	  pc (' '); pc ('(');
+	  for (i = 0; i < buffer->count; i ++)
+	    {
+	      s_cprintf (pc, "%x", buffer->bt[i]);
+	      if (i != buffer->count - 1)
+		pc (' ');
+	    }
+	  pc (')');
 	}
-      pc (')');
     }
 
   /* And add a terminating NUL.  */