Don't allow change of CRT frame returned by x509_crt_frame_acquire()
diff --git a/tests/suites/test_suite_x509parse.function b/tests/suites/test_suite_x509parse.function
index 87b8b78..2df187d 100644
--- a/tests/suites/test_suite_x509parse.function
+++ b/tests/suites/test_suite_x509parse.function
@@ -143,7 +143,7 @@
verify_print_context *ctx = (verify_print_context *) data;
char *p = ctx->p;
size_t n = ctx->buf + sizeof( ctx->buf ) - ctx->p;
- mbedtls_x509_crt_frame *frame;
+ mbedtls_x509_crt_frame const *frame;
mbedtls_x509_name *subject;
((void) flags);