nvmem: fix commenting style

Remove a redundant '*/' as pointed out by checkpatch.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/nvmem/core.c

@@ -1374,7 +1374,7 @@ EXPORT_SYMBOL_GPL(nvmem_device_cell_read);
  * @buf: buffer to be written to cell.
  *
  * Return: length of bytes written or negative error code on failure.
- * */
+ */
 int nvmem_device_cell_write(struct nvmem_device *nvmem,
 			    struct nvmem_cell_info *info, void *buf)
 {
@@ -1430,7 +1430,7 @@ EXPORT_SYMBOL_GPL(nvmem_device_read);
  * @buf: buffer to be written.
  *
  * Return: length of bytes written or negative error code on failure.
- * */
+ */
 int nvmem_device_write(struct nvmem_device *nvmem,
 		       unsigned int offset,
 		       size_t bytes, void *buf)