crash if initial db connection is failing

[ovidiusas]

latest opensips 2.1
tcp_start_process() is called with startup_done set to NULL and then when init_child() failed, an initialization to -1 is attempted.

(gdb) bt full
#0  tcp_start_processes (chd_rank=chd_rank@entry=0x84d7d0 <chd_rank.10322>, startup_done=startup_done@entry=0x0) at net/net_tcp.c:1723
        r = <optimized out>
        reader_fd = {15, 16}
        pid = <optimized out>
        si = <optimized out>
        load_p = 0x7fb12d4494a8
        __FUNCTION__ = "tcp_start_processes"
#1  0x0000000000419888 in main_loop () at main.c:728
        startup_done = 0x0
        chd_rank = 2
#2  main (argc=<optimized out>, argv=<optimized out>) at main.c:1259
        cfg_log_stderr = <optimized out>
        cfg_stream = <optimized out>
        c = <optimized out>
        r = 0
        tmp = 0x7ffceb4a687f ""
        tmp_len = <optimized out>
        port = <optimized out>
        proto = <optimized out>
        options = 0x5d0c08 "f:cCm:M:b:l:n:N:rRvdDFETSVhw:t:u:g:P:G:W:o:"
        seed = 3932613069
        rfd = <optimized out>
        __FUNCTION__ = "main"
(gdb) print startup_done
$1 = (int *) 0x0

[ionutrazvanionita]

fixed with c4ebfc8