test/openssl/test_ossl.rb: relax assertion for error messages

The test case test_error_data utilizes the error message generated by
X509V3_EXT_nconf_nid(). The next commit will use X509V3_EXT_nconf(),
which generates a slightly different error message. Let's adapt the
check to it.

test/openssl/test_ossl.rb

@@ -67,8 +67,9 @@ def test_error_data
     #
     # The generated message should look like:
     #     "subjectAltName = IP:not.a.valid.ip.address: bad ip address (value=not.a.valid.ip.address)"
+    #     "subjectAltName = IP:not.a.valid.ip.address: error in extension (name=subjectAltName, value=IP:not.a.valid.ip.address)"
     ef = OpenSSL::X509::ExtensionFactory.new
-    assert_raise_with_message(OpenSSL::X509::ExtensionError, /\(value=not.a.valid.ip.address\)/) {
+    assert_raise_with_message(OpenSSL::X509::ExtensionError, /\(value=(IP:)?not.a.valid.ip.address\)/) {
       ef.create_ext("subjectAltName", "IP:not.a.valid.ip.address")
     }
   end