drivers/parport/parport_ip32.c: use PTR_ERR_OR_ZERO

replace IS_ERR/PTR_ERR

Signed-off-by: Fabian Frederick <[e-mail]>
Cc: Wolfram Sang <[e-mail]>
Cc: Linus Walleij <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/parport/parport_ip32.c

···
 {
 	pr_info(PPIP32 "SGI IP32 built-in parallel port driver v0.6\n");
 	this_port = parport_ip32_probe_port();
-	return IS_ERR(this_port) ? PTR_ERR(this_port) : 0;
+	return PTR_ERR_OR_ZERO(this_port);
 }
 
 /**