HID: i2c-hid: fix kerneldoc warnings in i2c-hid-core.c

Fix following warnings caused by mismatch bewteen function parameters
and comments.
drivers/hid/i2c-hid/i2c-hid-core.c:331: warning: Function parameter or member 'data_len' not described in 'i2c_hid_set_or_send_report'
drivers/hid/i2c-hid/i2c-hid-core.c:331: warning: Excess function parameter 'len' description in 'i2c_hid_set_or_send_report'

Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/i2c-hid/i2c-hid-core.c

@@ -323,7 +323,7 @@ static int i2c_hid_get_report(struct i2c_client *client, u8 reportType,
  * @reportType: 0x03 for HID_FEATURE_REPORT ; 0x02 for HID_OUTPUT_REPORT
  * @reportID: the report ID
  * @buf: the actual data to transfer, without the report ID
- * @len: size of buf
+ * @data_len: size of buf
  * @use_data: true: use SET_REPORT HID command, false: send plain OUTPUT report
  */
 static int i2c_hid_set_or_send_report(struct i2c_client *client, u8 reportType,