passthrough StreamLog error type

src/middleware/logger.rs

@@ -322,13 +322,10 @@ pin_project! {
     }
 }
 
-impl<B> MessageBody for StreamLog<B>
-where
-    B: MessageBody,
-    B::Error: Into<Error>,
-{
-    type Error = Error;
+impl<B: MessageBody> MessageBody for StreamLog<B> {
+    type Error = B::Error;
 
+    #[inline]
     fn size(&self) -> BodySize {
         self.body.size()
     }
@@ -344,7 +341,7 @@ where
                 *this.size += chunk.len();
                 Poll::Ready(Some(Ok(chunk)))
             }
-            Some(Err(err)) => Poll::Ready(Some(Err(err.into()))),
+            Some(Err(err)) => Poll::Ready(Some(Err(err))),
             None => Poll::Ready(None),
         }
     }