Limit bullet overlays on walls (#33364)

* Limit bullet overlays on walls

* Whitespace bad

* Okay

* Touching this because I'm testing TGS3 stuff

* Update walls.dm

code/game/turfs/simulated/walls.dm

@@ -1,3 +1,5 @@
+#define MAX_DENT_DECALS 15
+
 /turf/closed/wall
 	name = "wall"
 	desc = "A huge chunk of metal used to separate rooms."
@@ -297,6 +299,9 @@
 	return FALSE
 
 /turf/closed/wall/proc/add_dent(denttype, x=rand(-8, 8), y=rand(-8, 8))
+	if(LAZYLEN(dent_decals) >= MAX_DENT_DECALS)
+		return
+
 	var/mutable_appearance/decal = pick(dent_decal_list[denttype])
 	decal.pixel_x = x
 	decal.pixel_y = y
@@ -304,3 +309,5 @@
 	cut_overlay(dent_decals)
 	LAZYADD(dent_decals, decal)
 	add_overlay(dent_decals)
+	
+#undef MAX_DENT_DECALS