Corrected trap splash count (#3683)

* Fixes #3675.
* Corrected the trap splash count to be a minimum of 1 to prevent divide by 0 attempts.
Thanks to @crazystorm2017!

src/map/skill.cpp

@@ -17691,7 +17691,7 @@ static int skill_trap_splash(struct block_list *bl, va_list ap)
 				int split_count = 0;
 
 				if (skill_get_nk(sg->skill_id)&NK_SPLASHSPLIT)
-					split_count = map_foreachinallrange(skill_area_sub, src, skill_get_splash(sg->skill_id, sg->skill_lv), BL_CHAR, src, sg->skill_id, sg->skill_lv, tick, BCT_ENEMY, skill_area_sub_count);
+					split_count = max(1, map_foreachinallrange(skill_area_sub, src, skill_get_splash(sg->skill_id, sg->skill_lv), BL_CHAR, src, sg->skill_id, sg->skill_lv, tick, BCT_ENEMY, skill_area_sub_count));
 				skill_attack(skill_get_type(sg->skill_id), ss, src, bl, sg->skill_id, sg->skill_lv, tick, split_count);
 			}
 			break;