fix(http): Fix commit fac3d70c0b

The new From<Chunk> for Bytes uses self instead of chunk in its
implementation of From::from.  Change it to chunk to fix the build.

src/http/chunk.rs

@@ -45,7 +45,7 @@ impl From<Bytes> for Chunk {
 
 impl From<Chunk> for Bytes {
     fn from(chunk: Chunk) -> Bytes {
-        match self.0 {
+        match chunk.0 {
             Inner::Shared(bytes) => bytes,
         }
     }