guard for 2 NULL pointer cases raised by coverity. Neither should occur in practice

svn path=/icecast/trunk/icecast/; revision=15358

src/auth.c

@@ -93,8 +93,7 @@ static void queue_auth_client (auth_client *auth_user, mount_proxy *mountinfo)
 {
     auth_t *auth;
 
-    if (auth_user == NULL || (mountinfo == NULL && auth_user->client
-                && auth_user->client->auth == NULL))
+    if (auth_user == NULL)
         return;
     auth_user->next = NULL;
     if (mountinfo)
@@ -107,6 +106,11 @@ static void queue_auth_client (auth_client *auth_user, mount_proxy *mountinfo)
     }
     else
     {
+        if (auth_user->client == NULL || auth_user->client->auth == NULL)
+        {
+            WARN1 ("internal state is incorrect for %p", auth_user->client);
+            return;
+        }
         auth = auth_user->client->auth;
         thread_mutex_lock (&auth->lock);
     }

src/auth_htpasswd.c

@@ -111,6 +111,8 @@ static void htpasswd_recheckfile (htpasswd_auth_state *htpasswd)
     char *sep;
     char line [MAX_LINE_LEN];
 
+    if (htpasswd->filename == NULL)
+        return;
     if (stat (htpasswd->filename, &file_stat) < 0)
     {
         WARN1 ("failed to check status of %s", htpasswd->filename);