HID: sony: Use the minimum accepted size for feature report 0xf2

Sixaxis devices accept feature report 0xf2 when size is >= 17, not 18.
Use the minimum accepted size.

The change is mainly for documentation purposes, the code worked fine
even before this change.
Signed-off-by: NAntonio Ospite <ao2@ao2.it>
Acked-by: NFrank Praznik <frank.praznik@oh.rr.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

drivers/hid/hid-sony.c

@@ -802,7 +802,7 @@ union sixaxis_output_report_01 {
 #define DS4_REPORT_0x05_SIZE 32
 #define DS4_REPORT_0x11_SIZE 78
 #define DS4_REPORT_0x81_SIZE 7
-#define SIXAXIS_REPORT_0xF2_SIZE 18
+#define SIXAXIS_REPORT_0xF2_SIZE 17
 
 static spinlock_t sony_dev_list_lock;
 static LIST_HEAD(sony_device_list);