Copter: Change fabs to fabsf

ArduCopter/control_guided.cpp

@@ -564,7 +564,7 @@ void Copter::guided_angle_control_run()
     float yaw_in = wrap_180_cd(guided_angle_state.yaw_cd);
 
     // constrain climb rate
-    float climb_rate_cms = constrain_float(guided_angle_state.climb_rate_cms, -fabs(wp_nav.get_speed_down()), wp_nav.get_speed_up());
+    float climb_rate_cms = constrain_float(guided_angle_state.climb_rate_cms, -fabsf(wp_nav.get_speed_down()), wp_nav.get_speed_up());
 
     // check for timeout - set lean angles and climb rate to zero if no updates received for 3 seconds
     uint32_t tnow = millis();