Fix misplaced #endif in test program

This broke the build when MBEDTLS_CERTS_C is undefined. Fixes #6243.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/ChangeLog.d/build-without-certs.txt b/ChangeLog.d/build-without-certs.txt
new file mode 100644
index 0000000..dcb5c77
--- /dev/null
+++ b/ChangeLog.d/build-without-certs.txt
@@ -0,0 +1,3 @@
+Bugfix
+   * Fix build errors in test programs when MBEDTLS_CERTS_C is disabled.
+     Fixes #6243.