Explicitly cast __iomem pointer to const void* with __force to fix the
following warning:

    incorrect type in argument 1 (different address spaces)
       expected void const volatile *address
       got char [noderef] __iomem *screen_base

Signed-off-by: Stanislav Kinsburskii <redacted>
Reported-by: kernel test robot <redacted>
Closes: https://lore.kernel.org/oe-kbuild-all/202311161120.BgyxTBMQ-lkp@intel.com/ (local)
---
  drivers/video/fbdev/fsl-diu-fb.c |    2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/fsl-diu-fb.c b/drivers/video/fbdev/fsl-diu-fb.c
index 7fbd9f069ac2..b0fda5bd1964 100644
--- a/drivers/video/fbdev/fsl-diu-fb.c
+++ b/drivers/video/fbdev/fsl-diu-fb.c

@@ -877,7 +877,7 @@ static int map_video_memory(struct fb_info *info)
  	}
  	mutex_lock(&info->mm_lock);
  	info->screen_base = p;
-	info->fix.smem_start = virt_to_phys(info->screen_base);
+	info->fix.smem_start = virt_to_phys((__force const void *)info->screen_base);
  	info->fix.smem_len = smem_len;
  	mutex_unlock(&info->mm_lock);
  	info->screen_size = info->fix.smem_len;