Fix a bug from previous commit: min -> MIN

src/frontend/plotting/plotcurv.c

@@ -139,7 +139,7 @@ ft_graf(struct dvec *v, struct dvec *xs, bool nostart)
         int slength = xs->v_length;
         if (slength != vlength)
             fprintf(stderr, "Warning: length of vector %s and its scale do not match, plot may be truncated!\n", v->v_name);
-        for (i = 0, j = min(vlength, slength); i < j; i++) {
+        for (i = 0, j = MIN(vlength, slength); i < j; i++) {
             dx = isreal(xs) ? xs->v_realdata[i] :
                 realpart(xs->v_compdata[i]);
             dy = isreal(v) ? v->v_realdata[i] :