Fix dialyzer warnings

Author: solnic

lib/sentry/opentelemetry/sampler.ex

@@ -59,7 +59,7 @@ if Code.ensure_loaded?(:otel_sampler) do
             case parent_sampled do
               "true" -> {:inherit, true, tracestate}
               "false" -> {:inherit, false, tracestate}
-              _ -> :no_parent
+              nil -> :no_parent
             end
           else
             :no_parent
@@ -95,13 +95,15 @@ if Code.ensure_loaded?(:otel_sampler) do
       ]
     end
 
+    defp get_tracestate_value({:tracestate, tracestate}, key) do
+      get_tracestate_value(tracestate, key)
+    end
+
     defp get_tracestate_value(tracestate, key) when is_list(tracestate) do
       case List.keyfind(tracestate, key, 0) do
         {^key, value} -> value
         nil -> nil
       end
     end
-
-    defp get_tracestate_value(_tracestate, _key), do: nil
   end
 end