sh: Fix boot crash related to SCI

Commit d006199e72a9 ("serial: sh-sci: Regtype probing doesn't need to be
fatal.") made sci_init_single() return when sci_probe_regmap() succeeds,
although it should return when sci_probe_regmap() fails.  This causes
systems using the serial sh-sci driver to crash during boot.

Fix the problem by using the right return condition.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/tty/serial/sh-sci.c

@@ -1889,7 +1889,7 @@ static int __devinit sci_init_single(struct platform_device *dev,
 
 	if (p->regtype == SCIx_PROBE_REGTYPE) {
 		ret = sci_probe_regmap(p);
-		if (unlikely(!ret))
+		if (unlikely(ret))
 			return ret;
 	}