fix #805 - close okio.Source when we create it with a File

Author: sammefford

src/main/java/com/marklogic/client/impl/OkHttpServices.java

@@ -101,6 +101,7 @@
 import okhttp3.logging.HttpLoggingInterceptor;
 import okio.BufferedSink;
 import okio.Okio;
+import okio.Source;
 import com.burgstaller.okhttp.AuthenticationCacheInterceptor;
 import com.burgstaller.okhttp.CachingAuthenticatorDecorator;
 import com.burgstaller.okhttp.digest.CachingAuthenticator;
@@ -5305,7 +5306,9 @@ public void writeTo(BufferedSink sink) throws IOException {
       if ( obj instanceof InputStream ) {
         sink.writeAll(Okio.source((InputStream) obj));
       } else if ( obj instanceof File ) {
-        sink.writeAll(Okio.source((File) obj));
+        try ( Source source = Okio.source((File) obj) ) {
+          sink.writeAll(source);
+        }
       } else if ( obj instanceof byte[] ) {
         sink.write((byte[]) obj);
       } else if ( obj instanceof String) {