Add missing \n in some testutil output

Reviewed-by: Andy Polyakov <appro@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5229)

test/testutil/format_output.c

diff --git a/test/testutil/format_output.c b/test/testutil/format_output.c
index 9b9bab1..4707ff7 100644
--- a/test/testutil/format_output.c
+++ b/test/testutil/format_output.c
@@ -299,7 +299,7 @@
     if (len > MEM_BUFFER_SIZE && (bufp = OPENSSL_malloc(len * 2)) == NULL) {
         bufp = buffer;
         len = MEM_BUFFER_SIZE;
-        test_printf_stderr("WARNING: these BIGNUMs have been truncated");
+        test_printf_stderr("WARNING: these BIGNUMs have been truncated\n");
     }
 
     if (bn1 != NULL) {
@@ -382,7 +382,7 @@
 void test_output_bignum(const char *name, const BIGNUM *bn)
 {
     if (bn == NULL || BN_is_zero(bn)) {
-        test_printf_stderr("bignum: '%s' = %s", name,
+        test_printf_stderr("bignum: '%s' = %s\n", name,
                            test_bignum_zero_null(bn));
     } else if (BN_num_bytes(bn) <= BN_OUTPUT_SIZE) {
         unsigned char buf[BN_OUTPUT_SIZE];