Remove unneeded workarounds for xref warnings

Author: fhunleth

lib/decoder.ex

@@ -89,11 +89,8 @@ defmodule Jason.Decoder do
   if Code.ensure_loaded?(Decimal) do
     defp float_decode_function(%{floats: :decimals}) do
       fn string, token, skip ->
-        # silence xref warning
-        decimal = Decimal
-
         try do
-          decimal.new(string)
+          Decimal.new(string)
         rescue
           Decimal.Error ->
             token_error(token, skip)

lib/encode.ex

@@ -258,9 +258,7 @@ defmodule Jason.Encode do
 
   if Code.ensure_loaded?(Decimal) do
     defp struct(value, _escape, _encode_map, Decimal) do
-      # silence the xref warning
-      decimal = Decimal
-      [?", decimal.to_string(value, :normal), ?"]
+      [?", Decimal.to_string(value, :normal), ?"]
     end
   end
 

lib/encoder.ex

@@ -227,9 +227,7 @@ end
 if Code.ensure_loaded?(Decimal) do
   defimpl Jason.Encoder, for: Decimal do
     def encode(value, _opts) do
-      # silence the xref warning
-      decimal = Decimal
-      [?", decimal.to_string(value), ?"]
+      [?", Decimal.to_string(value), ?"]
     end
   end
 end