qxl: drop unused generation variable

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20180810132236.25908-1-kraxel@redhat.com

hw/display/qxl.c

@@ -2057,7 +2057,6 @@ static void qxl_realize_common(PCIQXLDevice *qxl, Error **errp)
 
     qemu_spice_display_init_common(&qxl->ssd);
     qxl->mode = QXL_MODE_UNDEFINED;
-    qxl->generation = 1;
     qxl->num_memslots = NUM_MEMSLOTS;
     qemu_mutex_init(&qxl->track_lock);
     qemu_mutex_init(&qxl->async_lock);

hw/display/qxl.h

@@ -43,7 +43,6 @@ typedef struct PCIQXLDevice {
 
     enum qxl_mode      mode;
     uint32_t           cmdflags;
-    int                generation;
     uint32_t           revision;
 
     int32_t            num_memslots;