RapidIO: fix potential null deref in rio_setup_device()

The "goto cleanup" path can deference "rswitch" when it is NULL.

Reported-by: Dan Carpenter <[e-mail]>
Signed-off-by: Alexandre Bounine <[e-mail]>
Cc: Dan Carpenter <[e-mail]>
Cc: Kumar Gala <[e-mail]>
Cc: Matt Porter <[e-mail]>
Cc: Chul Kim <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/rapidio/rio-scan.c

···
 	return rdev;
 
 cleanup:
-	if (rio_is_switch(rdev))
+	if (rswitch)
 		kfree(rswitch->route_table);
 
 	kfree(rdev);