Fixed typo usb_vaild -> usb_valid

msg/system_power.msg

@@ -3,7 +3,7 @@ float32 voltage3V3_v	# Sensor 3V3 rail voltage
 uint8 v3v3_valid		# Sensor 3V3 rail voltage was read.
 uint8 usb_connected		# USB is connected when 1
 uint8 brick_valid		# brick bits power is good when bit 1
-uint8 usb_vaild 		# USB is valid when 1
+uint8 usb_valid 		# USB is valid when 1
 uint8 servo_valid		# servo power is good when 1
 uint8 periph_5V_OC		# peripheral overcurrent when 1
 uint8 hipower_5V_OC		# hi power peripheral overcurrent when 1

src/drivers/stm32/adc/adc.cpp

@@ -432,10 +432,10 @@ ADC::update_system_power(hrt_abstime now)
 	system_power.usb_connected = BOARD_ADC_USB_CONNECTED;
 	/* If provided used the Valid signal from HW*/
 #if defined(BOARD_ADC_USB_VALID)
-	system_power.usb_vaild = BOARD_ADC_USB_VALID;
+	system_power.usb_valid = BOARD_ADC_USB_VALID;
 #else
 	/* If not provided then use connected */
-	system_power.usb_vaild  = system_power.usb_connected;
+	system_power.usb_valid  = system_power.usb_connected;
 #endif
 
 	/* The valid signals (HW dependent) are associated with each brick */