Copter: remove pilot_throttle_checks()

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

ArduCopter/AP_Arming.cpp

@@ -58,7 +58,6 @@ bool AP_Arming_Copter::run_pre_arm_checks(bool display_failure)
 
     return parameter_checks(display_failure)
         & motor_checks(display_failure)
-        & pilot_throttle_checks(display_failure)
         & oa_checks(display_failure)
         & gcs_failsafe_check(display_failure)
         & winch_checks(display_failure)
@@ -344,25 +343,6 @@ bool AP_Arming_Copter::motor_checks(bool display_failure)
     return true;
 }
 
-bool AP_Arming_Copter::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 (copter.g.failsafe_throttle != FS_THR_DISABLED && copter.channel_throttle->get_radio_in() < copter.g.failsafe_throttle_value) {
-            #if FRAME_CONFIG == HELI_FRAME
-            const char *failmsg = "Collective below Failsafe";
-            #else
-            const char *failmsg = "Throttle below Failsafe";
-            #endif
-            check_failed(ARMING_CHECK_RC, display_failure, "%s", failmsg);
-            return false;
-        }
-    }
-
-    return true;
-}
-
 bool AP_Arming_Copter::oa_checks(bool display_failure)
 {
 #if AC_OAPATHPLANNER_ENABLED == ENABLED

ArduCopter/AP_Arming.h

@@ -45,7 +45,6 @@ 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);