usrsock_rpmsg: fix can't wake ppoll when no ACTION
N/A
no matter open/close CONFIG_SIGUSR1_ACTION, usrsock always do,
unmask SIGUSR1, set action to NULL.
@@ -839,6 +839,7 @@ int main(int argc, char *argv[])
pthread_mutex_init(&priv->mutex, NULL);
pthread_cond_init(&priv->cond, NULL);
+ signal(SIGUSR1, SIG_IGN);
sigprocmask(SIG_SETMASK, NULL, &sigmask);
sigaddset(&sigmask, SIGUSR1);
sigprocmask(SIG_SETMASK, &sigmask, NULL);
