[FIX] Mobs that were offered up to ghosts no longer get taken over by their old owners (#26650)

* Grab_ghost now checks the ckey of the mind

* Remove superfluous loops for getting ghosts.

* Early return for MMI

---------

Co-authored-by: adrermail@gmail.com <adrermail@gmail.com>

code/modules/mob/living/carbon/examine.dm

@@ -221,13 +221,7 @@
 		if(!just_sleeping)
 			msg += "<span class='deadsay'>[p_they(TRUE)] [p_are()] limp and unresponsive; there are no signs of life"
 			if(get_int_organ(/obj/item/organ/internal/brain) && !key)
-				var/foundghost = FALSE
-				if(mind)
-					for(var/mob/dead/observer/G in GLOB.player_list)
-						if(G.mind == mind && G.can_reenter_corpse)
-							foundghost = TRUE
-							break
-				if(!foundghost)
+				if(!get_ghost())
 					msg += " and [p_their()] soul has departed"
 			msg += "...</span>\n"
 

code/modules/mob/mob_misc_procs.dm

@@ -175,7 +175,8 @@
 		theghost = pick(candidates)
 		to_chat(M, "Your mob has been taken over by a ghost!")
 		message_admins("[key_name_admin(theghost)] has taken control of ([key_name_admin(M)])")
-		M.ghostize()
+		var/mob/dead/observer/ghost = M.ghostize(TRUE) // Keep them respawnable
+		ghost.can_reenter_corpse = FALSE // but keep them out of their old body
 		M.key = theghost.key
 		dust_if_respawnable(theghost)
 	else

code/modules/surgery/organs/brain.dm

@@ -59,14 +59,7 @@
 		. += "You can feel a bright spark of life in this one!"
 		return
 	if(brainmob?.mind)
-		var/foundghost = FALSE
-		for(var/mob/dead/observer/G in GLOB.player_list)
-			if(G.mind == brainmob.mind)
-				foundghost = TRUE
-				if(!G.can_reenter_corpse)
-					foundghost = FALSE
-				break
-		if(foundghost)
+		if(brainmob.get_ghost())
 			. += "You can feel the small spark of life still left in this one."
 			return