Fixed a typo in Stalk/Tunnel Drive speed calculation

git-svn-id: https://svn.code.sf.net/p/rathena/svn/branches/stable@1288 54d463be-8e91-2dee-dedb-b68131a5f0ec

Changelog-SVN.txt

@@ -18,6 +18,7 @@ Date	Added
 	* Print number of online users in online.txt/.html even if there's only 1 user
 	  online [celest]
 	* Updated obj_del to delete all GNUMakeFile and .o files + compiled exes [DracoRPG]
+	* Fixed a typo in Stalk / Tunnel Drive speed calculation [DracoRPG]
 
 03/23
         * Adjusted my trade fix [1280: MouseJstr]

src/map/status.c

@@ -921,7 +921,7 @@ int status_calc_pc(struct map_session_data* sd,int first)
 	if( (skill=pc_checkskill(sd,BS_WEAPONRESEARCH))>0)	// 武器?究の命中率?加
 		sd->hit += skill*2;
 	if(sd->status.option&2 && (skill = pc_checkskill(sd,RG_TUNNELDRIVE))>0 )	// トンネルドライブ	// トンネルドライブ
-		sd->speed += (100-16)*skill*DEFAULT_WALK_SPEED/100;
+		sd->speed = (100-16*skill)*DEFAULT_WALK_SPEED/100;
 		//sd->speed += (1.2*DEFAULT_WALK_SPEED - skill*9);		
 	if (pc_iscarton(sd) && (skill=pc_checkskill(sd,MC_PUSHCART))>0)	// カ?トによる速度低下
 		sd->speed += (10-skill) * (DEFAULT_WALK_SPEED * 0.1);