sesman: remove unnecessary fork for FreeBSD (#650)

it is not only unnecessary but causes another bug.

sesman/session.c

@@ -513,13 +513,7 @@ session_start_fork(tbus data, tui8 type, struct SCP_SESSION *s)
          *  $OpenBSD: session.c,v 1.252 2010/03/07 11:57:13 dtucker Exp $
          *  with some ideas about BSD process grouping to xrdp
          */
-        pid_t bsdsespid = g_fork();
 
-        if (bsdsespid == -1)
-        {
-        }
-        else if (bsdsespid == 0) /* BSD session leader */
-        {
         /**
          * Create a new session and process group since the 4.4BSD
          * setlogin() affects the entire process group
@@ -536,9 +530,6 @@ session_start_fork(tbus data, tui8 type, struct SCP_SESSION *s)
                         "setlogin failed for user %s - pid %d", s->username,
                         g_getpid());
         }
-        }
-
-        g_waitpid(bsdsespid);
 #endif
         wmpid = g_fork(); /* parent becomes X,
                              child forks wm, and waits, todo */