(sendmail_send_message): Failing waitpid is

not an error if errno==ECHILD (the calling program might have
ignored SIGCHLD).

@@ -441,11 +441,16 @@ sendmail_send_message (mu_mailer_t mailer, mu_message_t msg, mu_address_t from,
 
 	if (rc < 0)
 	  {
+	    if (errno == ECHILD)
+              status = 0;
+	    else
+              { 
 	        status = errno;
 	        MAILER_DEBUG2 (mailer, MU_DEBUG_TRACE,
 	  		       "waitpid(%d) failed: %s\n",
 			       sendmail->pid, strerror (status));
               }
+	  }
 	else if (WIFEXITED (exit_status))
 	  {
 	    exit_status = WEXITSTATUS (exit_status);