newport_con warning fix

drivers/video/console/newport_con.c: In function `newport_console_init':
drivers/video/console/newport_con.c:743: warning: return makes integer from pointer without a cast

Although one wonders whether that should have been -ENODEV...

Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/video/console/newport_con.c

@@ -738,9 +738,8 @@ const struct consw newport_con = {
 #ifdef MODULE
 static int __init newport_console_init(void)
 {
-
 	if (!sgi_gfxaddr)
-		return NULL;
+		return 0;
 
 	if (!npregs)
 		npregs = (struct newport_regs *)/* ioremap cannot fail */