Use `with` form properly

lib/asciinema/file_store.ex

@@ -19,9 +19,8 @@ defmodule Asciinema.FileStore do
       @behaviour Asciinema.FileStore
 
       def download_file(store_path, local_path) do
-        case open_file(store_path, &(:file.copy(&1, local_path))) do
-          {:ok, {:ok, _}} -> :ok
-          otherwise -> otherwise
+        with {:ok, {:ok, _}} <- open_file(store_path, &(:file.copy(&1, local_path))) do
+          :ok
         end
       end
     end

lib/asciinema/file_store/cached.ex

@@ -6,8 +6,6 @@ defmodule Asciinema.FileStore.Cached do
     with :ok <- remote_store().put_file(dst_path, src_local_path, content_type, compress),
          :ok <- cache_store().put_file(dst_path, src_local_path, content_type, compress) do
       :ok
-    else
-      otherwise -> otherwise
     end
   end
 
@@ -25,8 +23,6 @@ defmodule Asciinema.FileStore.Cached do
              :ok <- cache_store().put_file(path, tmp_path, MIME.path(path)),
              :ok <- File.rm(tmp_path) do
           cache_store().open_file(path, function)
-        else
-          otherwise -> otherwise
         end
       otherwise ->
         otherwise

lib/asciinema/file_store/s3.ex

@@ -14,9 +14,8 @@ defmodule Asciinema.FileStore.S3 do
       {body, opts}
     end
 
-    case make_request(S3.put_object(bucket(), base_path() <> dst_path, body, opts)) do
-      {:ok, _} -> :ok
-      otherwise -> otherwise
+    with {:ok, _} <- make_request(S3.put_object(bucket(), base_path() <> dst_path, body, opts)) do
+      :ok
     end
   end