tty vt: Fix a regression in command line edition

The commit 81732c3
("Fix line garbage in virtual console on command line edition")
made a regression with some machines: some characters were not erased
after line edition.

This patch adjusts the number of moved characters and the size of the
region to be updated.

Signed-off-by: Jean-François Moine <moinejf@free.fr>
Tested-by: Krzysztof Mazur <krzysiek@podlesie.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: moinejf

drivers/tty/vt/vt.c

@@ -539,25 +539,25 @@ static void insert_char(struct vc_data *vc, unsigned int nr)
 {
 	unsigned short *p = (unsigned short *) vc->vc_pos;
 
-	scr_memmovew(p + nr, p, vc->vc_cols - vc->vc_x);
+	scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x) * 2);
 	scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 	vc->vc_need_wrap = 0;
 	if (DO_UPDATE(vc))
 		do_update_region(vc, (unsigned long) p,
-			(vc->vc_cols - vc->vc_x) / 2 + 1);
+			vc->vc_cols - vc->vc_x);
 }
 
 static void delete_char(struct vc_data *vc, unsigned int nr)
 {
 	unsigned short *p = (unsigned short *) vc->vc_pos;
 
-	scr_memcpyw(p, p + nr, vc->vc_cols - vc->vc_x - nr);
+	scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
 	scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
 			nr * 2);
 	vc->vc_need_wrap = 0;
 	if (DO_UPDATE(vc))
 		do_update_region(vc, (unsigned long) p,
-			(vc->vc_cols - vc->vc_x) / 2);
+			vc->vc_cols - vc->vc_x);
 }
 
 static int softcursor_original;