Fixes player medbot overdoses

Makes braindead bots get back to work.

code/modules/mob/living/simple_animal/bot/bot.dm

@@ -149,6 +149,7 @@
 		locked = 0
 		emagged = 1
 		user << "<span class='notice'>You bypass [src]'s controls.</span>"
+		return
 	if(!locked && open) //Bot panel is unlocked by ID or emag, and the panel is screwed open. Ready for emagging.
 		emagged = 2
 		remote_disabled = 1 //Manually emagging the bot locks out the AI built in panel.
@@ -156,6 +157,7 @@
 		bot_reset()
 		turn_on() //The bot automatically turns on when emagged, unless recently hit with EMP.
 		src << "<span class='userdanger'>(#$*#$^^( OVERRIDE DETECTED</span>"
+		return
 	else //Bot is unlocked, but the maint panel has not been opened with a screwdriver yet.
 		user << "<span class='warning'>You need to open maintenance panel first!</span>"
 
@@ -182,7 +184,7 @@
 /mob/living/simple_animal/bot/handle_automated_action() //Master process which handles code common across most bots.
 	set background = BACKGROUND_ENABLED
 
-	if(!on || ckey)
+	if(!on || client)
 		return
 
 	switch(mode) //High-priority overrides are processed first. Bots can do nothing else while under direct command.
@@ -580,7 +582,7 @@ Pass a positive integer as an argument to override a bot's default speed.
 /mob/living/simple_animal/bot/proc/bot_control(command, mob/user, turf/user_turf, list/user_access = list())
 	if(!on || emagged == 2 || remote_disabled) //Emagged bots do not respect anyone's authority! Bots with their remote controls off cannot get commands.
 		return 1 //ACCESS DENIED
-	if(ckey)
+	if(client)
 		bot_control_message(command,user,user_turf,user_access)
 	// process control input
 	switch(command)
@@ -778,3 +780,7 @@ Pass a positive integer as an argument to override a bot's default speed.
 /mob/living/simple_animal/bot/Login()
 	. = ..()
 	access_card.access += player_access
+
+/mob/living/simple_animal/bot/Logout()
+	. = ..()
+	bot_reset()

code/modules/mob/living/simple_animal/bot/medbot.dm

@@ -447,6 +447,9 @@
 		bot_reset()
 		return
 	else
+		if(!emagged && check_overdose(patient,reagent_id,injection_amount))
+			soft_reset()
+			return
 		C.visible_message("<span class='danger'>[src] is trying to inject [patient]!</span>", \
 			"<span class='userdanger'>[src] is trying to inject you!</span>")
 
@@ -470,6 +473,13 @@
 	reagent_id = null
 	return
 
+/mob/living/simple_animal/bot/medbot/proc/check_overdose(mob/living/carbon/patient,reagent_id,injection_amount)
+	var/datum/reagent/R  = chemical_reagents_list[reagent_id]
+	var/current_volume = patient.reagents.get_reagent_amount(reagent_id)
+	if(current_volume + injection_amount > R.overdose_threshold)
+		return 1
+	return 0
+
 /mob/living/simple_animal/bot/medbot/bullet_act(obj/item/projectile/Proj)
 	if(Proj.flag == "taser")
 		stunned = min(stunned+10,20)