rcData[] is keeping the right values now.

Logic for valid flightchannel detection is inverted in order to detect
the first flightchannel failure instead of waiting to check them all.

Clear PWM channel capture on read.

This invalidates the control channels on read. They are validated by
receiving a good value BEFORE the aux channels are received. This is
done because control channels configures to go OFF on failsafe are
detected with a PWM capture time-out. Time-out took so long that all aux
channels where overwritten by their RX configured failsafe values BEFORE
the invalid (=OFF) control channel was detected.

src/main/drivers/pwm_rx.c

@@ -341,6 +341,8 @@ void ppmInConfig(const timerHardware_t *timerHardwarePtr)
 
 uint16_t pwmRead(uint8_t channel)
 {
-    return captures[channel];
+    uint16_t capture = captures[channel];
+    captures[channel] = PPM_RCVR_TIMEOUT;
+    return capture;
 }