binman: Output errors to stderr

At present binman outputs errors to stdout which means that fails are
effectively silent when printed by buildman, for example. Fix this by
outputing errors to stderr.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/tools/binman/main.py b/tools/binman/main.py
index efa7fa8386f158e372860ec6fdf90fef70e25380..0ab2bb62065aad96a699f0f101ef07a4bc77c2d5 100755 (executable)
--- a/tools/binman/main.py
+++ b/tools/binman/main.py
@@ -123,7 +123,7 @@ def RunBinman(args):
         try:
             ret_code = control.Binman(args)
         except Exception as e:
-            print('binman: %s' % e)
+            print('binman: %s' % e, file=sys.stderr)
             if args.debug:
                 print()
                 traceback.print_exc()