Fix seg in authenticate (bug #3686)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@5109 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/apps/app_voicemail.c b/apps/app_voicemail.c
index 090ad25..021b59a 100755 (executable)
--- a/apps/app_voicemail.c
+++ b/apps/app_voicemail.c
@@ -4452,7 +4452,7 @@ static int vm_authenticate(struct ast_channel *chan, char *mailbox, int mailbox_
                ast_play_and_wait(chan, "vm-goodbye");
                return -1;
        }
-       if (!skipuser) {
+       if (vmu && !skipuser) {
                memcpy(res_vmu, vmu, sizeof(struct ast_vm_user));
        }
        return 0;