qxl: fix vga port initialization.
Commit 0a039dc7 broke vga modes for qxl-vga by loosing vga_ioport_read windup. qxl needs to hook into vga port writes only and used to realize that by letting vga_init() do the work for both reads and writes, then overwrite the write function. That little detail was missed while doing the conversion ... This patch fixes it. It also switch qxl vga ioport registration to portio lists while being at it. Cc: Hans de Goede <hdegoede@redhat.com> Acked-by: NAlon Levy <alevy@redhat.com> Signed-off-by: NGerd Hoffmann <kraxel@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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