Fixed areawarp cell check

The script command areawarp has been checking the wrong target map for ages. It has been checking the mapindex rather than the mapid and therefore returned a wrong result.

src/map/script.c

@@ -5501,6 +5501,9 @@ static int buildin_areawarp_sub(struct block_list *bl,va_list ap)
 		pc_randomwarp((TBL_PC *)bl,CLR_TELEPORT);
 	else if(x3 && y3) {
 		int max, tx, ty, j = 0;
+		int16 m;
+
+		m = map_mapindex2mapid(index);
 
 		// choose a suitable max number of attempts
 		if( (max = (y3-y2+1)*(x3-x2+1)*3) > 1000 )
@@ -5511,7 +5514,7 @@ static int buildin_areawarp_sub(struct block_list *bl,va_list ap)
 			tx = rnd()%(x3-x2+1)+x2;
 			ty = rnd()%(y3-y2+1)+y2;
 			j++;
-		} while( map_getcell(index,tx,ty,CELL_CHKNOPASS) && j < max );
+		} while( map_getcell(m,tx,ty,CELL_CHKNOPASS) && j < max );
 
 		pc_setpos((TBL_PC *)bl,index,tx,ty,CLR_OUTSIGHT);
 	}