coredump.py:bug fix python file not have rename

tmpfile.rename(args.output)
    ^^^^^^^^^^^^^^
AttributeError: '_io.BufferedRandom' object has no attribute 'rename'. Did you mean: 'name'?

Signed-off-by: anjiahao <anjiahao@xiaomi.com>

tools/coredump.py

@@ -134,8 +134,8 @@ def main():
         outfile.close()
         os.unlink(tmp)
     else:
-        tmpfile.rename(args.output)
         tmpfile.close()
+        os.rename(tmp, args.output)
 
     print("Core file conversion completed: " + args.output)