PVS-Studio warning V595 for samba

static WERROR libnetapi_open_ipc_connection(
              struct libnetapi_ctx *ctx,
              const char *server_name,
              struct client_ipc_connection **pp)
{
  struct libnetapi_private_ctx *priv_ctx =
    (struct libnetapi_private_ctx *)ctx->private_data;
  struct user_auth_info *auth_info = NULL;
  struct cli_state *cli_ipc = NULL;
  struct client_ipc_connection *p;

  if (!ctx || !pp || !server_name) {
    return WERR_INVALID_PARAM;
  }
  ....
}

This suspicious code was found in samba project by PVS-Studio static code analyzer.
Warning message is:
V595 The 'ctx' pointer was utilized before it was verified against nullptr. Check lines: 67, 72. cm.c 67

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/