tailsitter_recovery initialize yaw_ff

src/lib/tailsitter_recovery/tailsitter_recovery.cpp

@@ -39,7 +39,8 @@
 #include <math.h>
 
 TailsitterRecovery::TailsitterRecovery():
-	_in_recovery_mode(false)
+	_in_recovery_mode(false),
+	_yaw_ff(0.0f)
 {
 	_att_p(0) = _att_p(1) = _att_p(2) = 4.0f;
 }