Corrected Stone Hard Skin Rune effects (#3713)

* Fixes #3693.
* Stone Hard Skin should not end after taking full damage.
Thanks to @slyx88 and @flamefury!

src/map/battle.cpp

@@ -1425,13 +1425,10 @@ int64 battle_calc_damage(struct block_list *src,struct block_list *bl,struct Dam
 			skill_castend_damage_id(bl,src,MH_MAGMA_FLOW,sce->val1,gettick(),0);
 
 		if( damage > 0 && (sce = sc->data[SC_STONEHARDSKIN]) ) {
-			sce->val2 -= (int)cap_value(damage,INT_MIN,INT_MAX);
 			if( src->type == BL_MOB ) //using explicit call instead break_equip for duration
 				sc_start(src,src, SC_STRIPWEAPON, 30, 0, skill_get_time2(RK_STONEHARDSKIN, sce->val1));
 			else if (flag&(BF_WEAPON|BF_SHORT))
 				skill_break_equip(src,src, EQP_WEAPON, 3000, BCT_SELF);
-			if( sce->val2 <= 0 )
-				status_change_end(bl, SC_STONEHARDSKIN, INVALID_TIMER);
 		}
 
 		if (src->type == BL_PC && sc->data[SC_GVG_GOLEM]) {

src/map/status.cpp

@@ -10377,15 +10377,10 @@ int status_change_start(struct block_list* src, struct block_list* bl,enum sc_ty
 			val2 = 500 + 100 * val1;
 			break;
 		case SC_STONEHARDSKIN:
-			{
-				int hp = status->hp / 5; // 20% of HP
-
-				if (sd)
-					val1 = sd->status.job_level * pc_checkskill(sd, RK_RUNEMASTERY) / 4; // DEF/MDEF Increase
-				if (!status_charge(bl, hp, 0))
-					return 0;
-				val2 = hp;
-			}
+			if (!status_charge(bl, status->hp / 5, 0)) // 20% of HP
+				return 0;
+			if (sd)
+				val1 = sd->status.job_level * pc_checkskill(sd, RK_RUNEMASTERY) / 4; // DEF/MDEF Increase
 			break;
 		case SC_REFRESH:
 			status_heal(bl, status_get_max_hp(bl) * 25 / 100, 0, 1);