staging: gasket Fix comparison with Null

Comparison with NULL is redundant
as pointer will evaluate to true if is non-NULL.
The change was suggested by checkpatch.pl.
Signed-off-by: Mayank Suman <mayanksuman@live.com>
Link: https://lore.kernel.org/r/PS1PR04MB2934D85E82A3730349F56FE9D6849@PS1PR04MB2934.apcprd04.prod.outlook.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/gasket/gasket_sysfs.c

@@ -228,7 +228,7 @@ int gasket_sysfs_create_entries(struct device *device,
 	}
 
 	mutex_lock(&mapping->mutex);
-	for (i = 0; attrs[i].attr.attr.name != NULL; i++) {
+	for (i = 0; attrs[i].attr.attr.name; i++) {
 		if (mapping->attribute_count == GASKET_SYSFS_MAX_NODES) {
 			dev_err(device,
 				"Maximum number of sysfs nodes reached for device\n");