parisc: fbdev/stifb: Align graphics memory size to 4MB

commit aca7c13 upstream.

Independend of the current graphics resolution, adjust the reported
graphics card memory size to the next 4MB boundary.
This fixes the fbtest program which expects a naturally aligned size.

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/video/fbdev/stifb.c

@@ -1298,7 +1298,7 @@ static int __init stifb_init_fb(struct sti_struct *sti, int bpp_pref)
 
 	/* limit fbsize to max visible screen size */
 	if (fix->smem_len > yres*fix->line_length)
-		fix->smem_len = yres*fix->line_length;
+		fix->smem_len = ALIGN(yres*fix->line_length, 4*1024*1024);
 
 	fix->accel = FB_ACCEL_NONE;