staging: speakup: fix printk format warning

Fix printk format warning:

drivers/staging/speakup/serialio.c:44: warning: format '%x' expects type 'unsigned int', but argument 2 has type 'long unsigned int'
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: <speakup@braille.uwo.ca>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/speakup/serialio.c

@@ -41,7 +41,7 @@ struct serial_state *spk_serial_init(int index)
 		__release_region(&ioport_resource, ser->port, 8);
 		err = synth_request_region(ser->port, 8);
 		if (err) {
-			pr_warn("Unable to allocate port at %x, errno %i", ser->port, err);
+			pr_warn("Unable to allocate port at %lx, errno %i", ser->port, err);
 			return NULL;
 		}
 	}