Fixes an issue with Hivebot bombers (#7327)

Basically if two exploded in close proximity to each other it could lead to infinite recursion, crashing the server.

code/modules/mob/living/simple_animal/hostile/hivebot.dm

@@ -75,6 +75,7 @@
 	icon_state = "hivebotbomber"
 	attacktext = "bumped"
 	move_to_delay = 8
+	var/has_exploded = FALSE
 
 /mob/living/simple_animal/hostile/hivebot/bomber/AttackingTarget()
 	..()
@@ -82,19 +83,22 @@
 	stance = HOSTILE_STANCE_TIRED
 	stop_automated_movement = 1
 	wander = 0
-
-	playsound(src.loc, 'sound/items/countdown.ogg', 125, 1)
-	spawn(20)
-		fragem(src,10,30,2,3,5,1,0)
-		src.gib()
+	if(!has_exploded)
+		playsound(src.loc, 'sound/items/countdown.ogg', 125, 1)
+		has_exploded = TRUE
+		addtimer(CALLBACK(src, .proc/burst), 20)
 
 /mob/living/simple_animal/hostile/hivebot/bomber/bullet_act(var/obj/item/projectile/Proj)
 	if(istype(Proj, /obj/item/projectile/bullet/pistol/hivebotspike) || istype(Proj, /obj/item/projectile/beam/hivebot))
 		Proj.no_attack_log = 1
 		return PROJECTILE_CONTINUE
-	else
-		fragem(src,10,30,2,3,5,1,0)
-		src.gib()
+	else if(!has_exploded)
+		has_exploded = TRUE
+		burst()
+
+/mob/living/simple_animal/hostile/hivebot/bomber/proc/burst()
+	fragem(src,10,30,2,3,5,1,0)
+	src.gib()
 
 /mob/living/simple_animal/hostile/hivebot/range
 	name = "Hivebot"

html/changelogs/191103-bugfix_hivebombers.yml

@@ -0,0 +1,41 @@
+################################
+# Example Changelog File
+#
+# Note: This file, and files beginning with ".", and files that don't end in ".yml" will not be read. If you change this file, you will look really dumb.
+#
+# Your changelog will be merged with a master changelog. (New stuff added only, and only on the date entry for the day it was merged.)
+# When it is, any changes listed below will disappear.
+#
+# Valid Prefixes: 
+#   bugfix
+#   wip (For works in progress)
+#   tweak
+#   soundadd
+#   sounddel
+#   rscadd (general adding of nice things)
+#   rscdel (general deleting of nice things)
+#   imageadd
+#   imagedel
+#   maptweak
+#   spellcheck (typo fixes)
+#   experiment
+#   balance
+#   admin
+#   backend
+#   security
+#   refactor
+#################################
+
+# Your name.  
+author: Ferner
+
+# Optional: Remove this file after generating master changelog.  Useful for PR changelogs that won't get used again.
+delete-after: True
+
+# Any changes you've made.  See valid prefix list above.
+# INDENT WITH TWO SPACES.  NOT TABS.  SPACES.
+# SCREW THIS UP AND IT WON'T WORK.
+# Also, all entries are changed into a single [] after a master changelog generation. Just remove the brackets when you add new entries.
+# Please surround your changes in  double quotes ("), as certain characters otherwise screws up compiling. The quotes will not show up in the changelog.
+changes: 
+  - bugfix: "Fixed an issue with hivebot bombers that could lead to infinite recursion."