Revert "fbdev: atafb - add palette register check"

This reverts commit 8546e3ce, as it's a
partial duplicate of commit 2f390380
("fbdev: add palette register check to several drivers").

The former went in first through the m68k tree, the latter through Andrew
Morton.
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/video/atafb.c

@@ -2245,9 +2245,6 @@ static int ext_setcolreg(unsigned int regno, unsigned int red,
 	if (regno > 255)
 		return 1;
 
-	if (regno > 255)
-		return 1;
-
 	switch (external_card_type) {
 	case IS_VGA:
 		OUTB(0x3c8, regno);