BUGFIX:GPS not working. Invalid values passed to px4_arch_configgpio

   This is the root cause of #9461
   The _pins array was initialized to -1. It was used to index the
   _gpios array. The value at _gpios[-1] was a number that mapped to
   Analog mode on Port A pin 0. These is the UART4_TX pin and was
   being reconfigured by the fault in the camera_trigger to an
   alaog input.

src/drivers/camera_trigger/interfaces/src/gpio.cpp

@@ -22,8 +22,11 @@ CameraInterfaceGPIO::~CameraInterfaceGPIO()
 void CameraInterfaceGPIO::setup()
 {
 	for (unsigned i = 0; i < arraySize(_pins); i++) {
-		px4_arch_configgpio(_gpios[_pins[i]]);
-		px4_arch_gpiowrite(_gpios[_pins[i]], !_polarity);
+		// Pin range is ranges from 1 to 6
+		if (_pins[i] > 0 && _pins[i] < (int)arraySize(_gpios)) {
+			px4_arch_configgpio(_gpios[_pins[i]]);
+			px4_arch_gpiowrite(_gpios[_pins[i]], !_polarity);
+		}
 	}
 }