HID: nintendo: fix unused const warning

JC_RUMBLE_ZERO_AMP_PKT_CNT is only used when force feedback support in
the driver is enabled. Place the declaration in the CONFIG_NINTENDO_FF
ifdef to avoid a warning when compiling without rumble support.
Signed-off-by: Daniel J. Ogorchock <djogorchock@gmail.com>
Reviewed-by: Silvan Jegen <s.jegen@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-nintendo.c

@@ -292,6 +292,7 @@ static const struct joycon_rumble_amp_data joycon_rumble_amplitudes[] = {
 };
 static const u16 JC_RUMBLE_DFLT_LOW_FREQ = 160;
 static const u16 JC_RUMBLE_DFLT_HIGH_FREQ = 320;
+static const unsigned short JC_RUMBLE_ZERO_AMP_PKT_CNT = 5;
 #endif /* IS_ENABLED(CONFIG_NINTENDO_FF) */
 static const u16 JC_RUMBLE_PERIOD_MS = 50;
 
@@ -402,8 +403,6 @@ struct joycon_input_report {
 #define JC_RUMBLE_DATA_SIZE	8
 #define JC_RUMBLE_QUEUE_SIZE	8
 
-static const unsigned short JC_RUMBLE_ZERO_AMP_PKT_CNT = 5;
-
 static const char * const joycon_player_led_names[] = {
 	LED_FUNCTION_PLAYER1,
 	LED_FUNCTION_PLAYER2,