delete unused SENSORIOCGQUEUEDEPTH

src/drivers/mpu9250/mag.cpp

@@ -354,9 +354,6 @@ MPU9250_mag::ioctl(struct file *filp, int cmd, unsigned long arg)
 			return OK;
 		}
 
-	case SENSORIOCGQUEUEDEPTH:
-		return _mag_reports->size();
-
 	case MAGIOCGSAMPLERATE:
 		return MPU9250_AK8963_SAMPLE_RATE;
 

src/drivers/mpu9250/mpu9250.cpp

@@ -888,9 +888,6 @@ MPU9250::ioctl(struct file *filp, int cmd, unsigned long arg)
 			return OK;
 		}
 
-	case SENSORIOCGQUEUEDEPTH:
-		return _accel_reports->size();
-
 	case ACCELIOCGSAMPLERATE:
 		return _sample_rate;
 
@@ -961,9 +958,6 @@ MPU9250::gyro_ioctl(struct file *filp, int cmd, unsigned long arg)
 			return OK;
 		}
 
-	case SENSORIOCGQUEUEDEPTH:
-		return _gyro_reports->size();
-
 	case GYROIOCGSAMPLERATE:
 		return _sample_rate;