staging: fieldbus: anybus-s: fix wait_for_completion_timeout return handling

wait_for_completion_timeout() returns unsigned long (0 on timeout or
remaining jiffies) not int. Assigning this return value to int may
theoretically overflow (though not in this case where TIMEOUT is
only HZ*2).

Fix this inconsistency by wrapping the wait_for_completion_timeout
into the if().
Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Reviewed-by: Sven Van Asbroeck <TheSven73@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fieldbus/anybuss/host.c

@@ -1325,11 +1325,10 @@ anybuss_host_common_probe(struct device *dev,
 	 *   interrupt came in: ready to go !
 	 */
 	reset_deassert(cd);
-	ret = wait_for_completion_timeout(&cd->card_boot, TIMEOUT);
-	if (ret == 0)
+	if (!wait_for_completion_timeout(&cd->card_boot, TIMEOUT)) {
 		ret = -ETIMEDOUT;
-	if (ret < 0)
 		goto err_reset;
+	}
 	/*
 	 * according to the anybus docs, we're allowed to read these
 	 * without handshaking / reserving the area