m68k: Return -ENODEV if no device is found

According to the tests in do_initcalls(), the proper error code in case no
device is found is -ENODEV, not -ENXIO or -EIO.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/video/atafb.c b/drivers/video/atafb.c
index dff3547..c860573 100644
--- a/drivers/video/atafb.c
+++ b/drivers/video/atafb.c
@@ -3110,7 +3110,7 @@
 	printk("atafb_init: start\n");
 
 	if (!MACH_IS_ATARI)
-		return -ENXIO;
+		return -ENODEV;
 
 	do {
 #ifdef ATAFB_EXT