simplify isfixed conditions

dwm.c

@@ -1981,8 +1981,7 @@ updatesizehints(Client *c)
 		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
 	} else
 		c->maxa = c->mina = 0.0;
-	c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
-		&& c->maxw == c->minw && c->maxh == c->minh);
+	c->isfixed = (c->maxw && c->maxh && c->maxw == c->minw && c->maxh == c->minh);
 }
 
 void