Blimp: remove pilot_throttle_checks()

This method is redundant as throttle below FS_THR_THROTTLE value is already checked in set_throttle_and_failsafe() method.

Blimp/AP_Arming.cpp

@@ -48,7 +48,6 @@ bool AP_Arming_Blimp::run_pre_arm_checks(bool display_failure)
     return fence_checks(display_failure)
            & parameter_checks(display_failure)
            & motor_checks(display_failure)
-           & pilot_throttle_checks(display_failure)
            & gcs_failsafe_check(display_failure)
            & alt_checks(display_failure)
            & AP_Arming::pre_arm_checks(display_failure);
@@ -151,21 +150,6 @@ bool AP_Arming_Blimp::motor_checks(bool display_failure)
     return true;
 }
 
-bool AP_Arming_Blimp::pilot_throttle_checks(bool display_failure)
-{
-    // check throttle is above failsafe throttle
-    // this is near the bottom to allow other failures to be displayed before checking pilot throttle
-    if ((checks_to_perform == ARMING_CHECK_ALL) || (checks_to_perform & ARMING_CHECK_RC)) {
-        if (blimp.g.failsafe_throttle != FS_THR_DISABLED && blimp.channel_down->get_radio_in() < blimp.g.failsafe_throttle_value) {
-            const char *failmsg = "Throttle below Failsafe";
-            check_failed(ARMING_CHECK_RC, display_failure, "%s", failmsg);
-            return false;
-        }
-    }
-
-    return true;
-}
-
 bool AP_Arming_Blimp::rc_calibration_checks(bool display_failure)
 {
     return true;

Blimp/AP_Arming.h

@@ -44,7 +44,6 @@ protected:
     // NOTE! the following check functions *DO NOT* call into AP_Arming!
     bool parameter_checks(bool display_failure);
     bool motor_checks(bool display_failure);
-    bool pilot_throttle_checks(bool display_failure);
     bool oa_checks(bool display_failure);
     bool mandatory_gps_checks(bool display_failure);
     bool gcs_failsafe_check(bool display_failure);