don't pass const string where a modifyable string is expected

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Viktor Dukhovni <viktor@openssl.org>

diff --git a/test/testutil/tap_bio.c b/test/testutil/tap_bio.c
index 1b3881c7ee65ff692c88bb5a7b6a3419de8f5f05..f3ee2787d21ee65e95d9d73f02195806e88ede79 100644 (file)
--- a/test/testutil/tap_bio.c
+++ b/test/testutil/tap_bio.c
@@ -93,13 +93,14 @@ static int write_string(BIO *b, const char *buf, size_t n)
  */
 static int tap_write_ex(BIO *b, const char *buf, size_t size, size_t *in_size)
 {
+    static char empty[] = "";
     BIO *next = BIO_next(b);
     size_t i;
     int j;
 
     for (i = 0; i < size; i++) {
         if (BIO_get_data(b) == NULL) {
-            BIO_set_data(b, "");
+            BIO_set_data(b, empty);
             for (j = 0; j < subtest_level(); j++)
                 if (!write_string(next, " ", 1))
                     goto err;