Input: synaptics-rmi4 - remove set but not used variable 'sensor_flags'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/input/rmi4/rmi_f12.c: In function rmi_f12_read_sensor_tuning:
drivers/input/rmi4/rmi_f12.c:76:6: warning: variable sensor_flags set but not used [-Wunused-but-set-variable]

It's not used since introduction in
commit b43d2c1e9353 ("Input: synaptics-rmi4 - add support for F12")

Signed-off-by: YueHaibing <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/rmi4/rmi_f12.c

···
 	int pitch_y = 0;
 	int rx_receivers = 0;
 	int tx_receivers = 0;
-	int sensor_flags = 0;
 
 	item = rmi_get_register_desc_item(&f12->control_reg_desc, 8);
 	if (!item) {
···
 		offset += 2;
 	}
 
-	if (rmi_register_desc_has_subpacket(item, 4)) {
-		sensor_flags = buf[offset];
+	/* Skip over sensor flags */
+	if (rmi_register_desc_has_subpacket(item, 4))
 		offset += 1;
-	}
 
 	sensor->x_mm = (pitch_x * rx_receivers) >> 12;
 	sensor->y_mm = (pitch_y * tx_receivers) >> 12;