tty: vt: remove unused consw::con_flush_scrollback()

consw::con_flush_scrollback() is unused since commit 973c096f
(vgacon: remove software scrollback support). Drop it.
Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Tested-by: Helge Deller <deller@gmx.de> # parisc STI console
Link: https://lore.kernel.org/r/20240122110401.7289-45-jirislaby@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/vt/vt.c

@@ -888,21 +888,18 @@ static void flush_scrollback(struct vc_data *vc)
 	WARN_CONSOLE_UNLOCKED();
 
 	set_origin(vc);
-	if (vc->vc_sw->con_flush_scrollback) {
-		vc->vc_sw->con_flush_scrollback(vc);
-	} else if (con_is_visible(vc)) {
-		/*
-		 * When no con_flush_scrollback method is provided then the
-		 * legacy way for flushing the scrollback buffer is to use
-		 * a side effect of the con_switch method. We do it only on
-		 * the foreground console as background consoles have no
-		 * scrollback buffers in that case and we obviously don't
-		 * want to switch to them.
-		 */
-		hide_cursor(vc);
-		vc->vc_sw->con_switch(vc);
-		set_cursor(vc);
-	}
+	if (!con_is_visible(vc))
+		return;
+
+	/*
+	 * The legacy way for flushing the scrollback buffer is to use a side
+	 * effect of the con_switch method. We do it only on the foreground
+	 * console as background consoles have no scrollback buffers in that
+	 * case and we obviously don't want to switch to them.
+	 */
+	hide_cursor(vc);
+	vc->vc_sw->con_switch(vc);
+	set_cursor(vc);
 }
 
 /*

include/linux/console.h

@@ -96,10 +96,6 @@ struct consw {
 			enum vc_intensity intensity,
 			bool blink, bool underline, bool reverse, bool italic);
 	void	(*con_invert_region)(struct vc_data *vc, u16 *p, int count);
-	/*
-	 * Flush the video console driver's scrollback buffer
-	 */
-	void	(*con_flush_scrollback)(struct vc_data *vc);
 	/*
 	 * Prepare the console for the debugger.  This includes, but is not
 	 * limited to, unblanking the console, loading an appropriate