Fix bridges function

src/IGraph/Algorithms/Structure.chs

@@ -220,13 +220,13 @@ articulationPoints gr = unsafePerformIO $ allocaVector $ \res -> do
 
 -- ^ Find all bridges in a graph.
 bridges :: Graph d v e -> [Edge]
-bridges gr = unsafePerformIO $ allocaVector $ \res -> do
+bridges gr = unsafePerformIO $ allocaVectorInt $ \res -> do
   igraphBridges (_graph gr) res
-  map (getEdgeByEid gr) <$> toNodes res
+  map (getEdgeByEid gr) <$> toIntList res
 {-# INLINE igraphBridges #-}
 {#fun igraph_bridges as ^
     { `IGraph'
-    , castPtr `Ptr Vector'
+    , castPtr `Ptr VectorInt'
     } -> `CInt' void- #}
 
 -- | Checks whether a graph is a directed acyclic graph (DAG) or not.