fix indent typo and remove used variable

dygraph/paddleseg/models/common/pyramid_pool.py

@@ -156,7 +156,6 @@ class PPModule(nn.Layer):
     def forward(self, input):
         cat_layers = []
         for i, stage in enumerate(self.stages):
-            size = self.bin_sizes[i]
             x = stage(input)
             x = F.resize_bilinear(x, out_shape=input.shape[2:])
             cat_layers.append(x)