patman: Don't clear progress in tout unless it was used

At present calling Uninit() always called ClearProgress() which outputs
a \r character as well as spaces to remove any progress information on the
line. This can mess up the normal output of binman and other tools. Fix
this by outputing this only when progress information has actually been
previous written.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/patman/tout.py

@@ -15,6 +15,8 @@ NOTICE = 2
 INFO = 3
 DEBUG = 4
 
+in_progress = False
+
 """
 This class handles output of progress and other useful information
 to the user. It provides for simple verbosity level control and can
@@ -48,9 +50,11 @@ def UserIsPresent():
 
 def ClearProgress():
     """Clear any active progress message on the terminal."""
-    if verbose > 0 and stdout_is_tty:
+    global in_progress
+    if verbose > 0 and stdout_is_tty and in_progress:
         _stdout.write('\r%s\r' % (" " * len (_progress)))
         _stdout.flush()
+        in_progress = False
 
 def Progress(msg, warning=False, trailer='...'):
     """Display progress information.
@@ -58,6 +62,7 @@ def Progress(msg, warning=False, trailer='...'):
     Args:
         msg: Message to display.
         warning: True if this is a warning."""
+    global in_progress
     ClearProgress()
     if verbose > 0:
         _progress = msg + trailer
@@ -65,6 +70,7 @@ def Progress(msg, warning=False, trailer='...'):
             col = _color.YELLOW if warning else _color.GREEN
             _stdout.write('\r' + _color.Color(col, _progress))
             _stdout.flush()
+            in_progress = True
         else:
             _stdout.write(_progress + '\n')