nvmem: core: add single sysfs group

The sysfs core provides a function to easily register a single group.
Use it and remove the now unnecessary nvmem_cells_groups array.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20240705074852.423202-10-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: t-8ch

drivers/nvmem/core.c

@@ -367,11 +367,6 @@ static const struct attribute_group *nvmem_dev_groups[] = {
 	NULL,
 };
 
-static const struct attribute_group *nvmem_cells_groups[] = {
-	&nvmem_cells_group,
-	NULL,
-};
-
 static struct bin_attribute bin_attr_nvmem_eeprom_compat = {
 	.attr	= {
 		.name	= "eeprom",
@@ -478,7 +473,7 @@ static int nvmem_populate_sysfs_cells(struct nvmem_device *nvmem)
 
 	nvmem_cells_group.bin_attrs = cells_attrs;
 
-	ret = device_add_groups(&nvmem->dev, nvmem_cells_groups);
+	ret = device_add_group(&nvmem->dev, &nvmem_cells_group);
 	if (ret)
 		goto unlock_mutex;