fbcon: Do not set palette if console is not visible

A long standing bug in fbcon where switching/opening a vt will also set the palette even if the vt is in the background. This results in color corruption in the foreground vt.

From: Antonino Daplas <[email protected]>

---

 fbcon.c |    3 +++
 1 files changed, 3 insertions(+)

diff -Nru a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c
@@ -2331,6 +2331,9 @@
 	if (fbcon_is_inactive(vc, info))
 		return -EINVAL;
 
+	if (!CON_IS_VISIBLE(vc))
+		return 0;
+
 	depth = fb_get_color_depth(&info->var);
 	if (depth > 3) {
 		for (i = j = 0; i < 16; i++) {

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