fix make_dropout_layer

If you want to resize dropout layer, you may want to realloc inputs*l->batch*sizeof(float).

src/dropout_layer.c

@@ -27,6 +27,8 @@ dropout_layer make_dropout_layer(int batch, int inputs, float probability)
 
 void resize_dropout_layer(dropout_layer *l, int inputs)
 {
+    l->inputs = inputs
+    l->outputs = inputs
     l->rand = realloc(l->rand, inputs*l->batch*sizeof(float));
     #ifdef GPU
     cuda_free(l->rand_gpu);