Add SPDX license identifiers

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/test/accept-test.c b/test/accept-test.c
index e3e89cd..d1a31bf 100644
--- a/test/accept-test.c
+++ b/test/accept-test.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: MIT */
 /*
  * Description: Check to see if accept handles addr and addrlen
  */