nvdimm: Use str_plural() to simplify the code

Use the string choice helper function str_plural() to simplify the code.

Signed-off-by: Xichao Zhao <zhao.xichao@vivo.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>

Author: Xichao Zhao

drivers/nvdimm/namespace_devs.c

@@ -1983,7 +1983,7 @@ static struct device **scan_labels(struct nd_region *nd_region)
 	}
 
 	dev_dbg(&nd_region->dev, "discovered %d namespace%s\n", count,
-		count == 1 ? "" : "s");
+		str_plural(count));
 
 	if (count == 0) {
 		struct nd_namespace_pmem *nspm;

drivers/nvdimm/region.c

@@ -70,7 +70,7 @@ static int nd_region_probe(struct device *dev)
 	 * "<async-registered>/<total>" namespace count.
 	 */
 	dev_err(dev, "failed to register %d namespace%s, continuing...\n",
-			err, err == 1 ? "" : "s");
+			err, str_plural(err));
 	return 0;
 }