Fix warnings, unused and shadowed variables

src/mkmaze.c

@@ -879,7 +879,6 @@ fumaroles()
     for (n = rn2(3)+2; n; n--) {
 	xchar x = rn1(COLNO-4,3);
 	xchar y = rn1(ROWNO-4,3);
-	struct trap *ttmp = t_at(x,y);
 	if (levl[x][y].typ == LAVAPOOL) {
 	    NhRegion *r = create_gas_cloud(x,y, 4+rn2(5), rn1(10,5));
 	    clear_heros_fault(r);