staging: android: ion: make locally used functions static

Functions ion_handle_put and ion_handle_get_by_id are only used locally
in ion.c, so they should be made static as they used to be before
9590232b ("staging/android/ion : fix a race condition in the ion driver").
Signed-off-by: NMarkus Böhme <markus.boehme@mailbox.org>
Reviewed-by: NSumit Semwal <sumit.semwal@linaro.org>
Reviewed-by: NLaura Abbott <labbott@redhat.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/android/ion/ion.c

@@ -396,7 +396,7 @@ static int ion_handle_put_nolock(struct ion_handle *handle)
 	return ret;
 }
 
-int ion_handle_put(struct ion_handle *handle)
+static int ion_handle_put(struct ion_handle *handle)
 {
 	struct ion_client *client = handle->client;
 	int ret;
@@ -438,8 +438,8 @@ static struct ion_handle *ion_handle_get_by_id_nolock(struct ion_client *client,
 	return handle ? handle : ERR_PTR(-EINVAL);
 }
 
-struct ion_handle *ion_handle_get_by_id(struct ion_client *client,
-						int id)
+static struct ion_handle *ion_handle_get_by_id(struct ion_client *client,
+					       int id)
 {
 	struct ion_handle *handle;