dca: Use PTR_ERR_OR_ZERO() to simplify code

The function PTR_ERR_OR_ZERO() contains the check of
IS_ERR() and the return of PTR_ERR() or zero.

Signed-off-by: Zhang Shengju <[e-mail]>
Signed-off-by: Tang Bin <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/dca/dca-sysfs.c

···
 
 	cd = device_create(dca_class, dca->cd, MKDEV(0, slot + 1), NULL,
 			   "requester%d", req_count++);
-	if (IS_ERR(cd))
-		return PTR_ERR(cd);
-	return 0;
+	return PTR_ERR_OR_ZERO(cd);
 }
 
 void dca_sysfs_remove_req(struct dca_provider *dca, int slot)