video: Handle the 'bell' character

This can be sent when to many characters are entered. Make sure it is
ignored and does not cause a character to be displayed.

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

drivers/video/vidconsole-uclass.c

@@ -91,6 +91,9 @@ int vidconsole_put_char(struct udevice *dev, char ch)
 	int ret;
 
 	switch (ch) {
+	case '\a':
+		/* beep */
+		break;
 	case '\r':
 		priv->xcur_frac = 0;
 		break;

test/dm/video.c

@@ -124,7 +124,7 @@ DM_TEST(dm_test_video_text, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
 static int dm_test_video_chars(struct unit_test_state *uts)
 {
 	struct udevice *dev, *con;
-	const char *test_string = "Well\b\b\b\bxhe is\r \n\ta very modest  \bman\n\t\tand Has much to\b\bto be modest about.";
+	const char *test_string = "Well\b\b\b\bxhe is\r \n\ta very \amodest  \bman\n\t\tand Has much to\b\bto be modest about.";
 	const char *s;
 
 	ut_assertok(uclass_get_device(UCLASS_VIDEO, 0, &dev));