login-common: Make login_proxy_free(&NULL) no-op

Fixes segfault when proxying loops.

Broken in a1acd71cf65e6a6b92a6bdd1c1a5479f24d4aa35

diff --git a/src/login-common/login-proxy.c b/src/login-common/login-proxy.c
index da58b169963cfb7d7cfeb1265e7ca89412ea1ebd..20b2fd3147f9a64fff035018aa4853361260fea1 100644 (file)
--- a/src/login-common/login-proxy.c
+++ b/src/login-common/login-proxy.c
@@ -703,6 +703,8 @@ login_proxy_free_full(struct login_proxy **_proxy, const char *log_msg,
 void login_proxy_free(struct login_proxy **_proxy)
 {
        struct login_proxy *proxy = *_proxy;
+       if (proxy == NULL)
+               return;
 
        i_assert(!proxy->detached || proxy->client->destroyed);
        /* Note: The NULL error is never even attempted to be used here. */