[sr-dev] [kamailio/kamailio] crash on run_rr_callbacks() from dlg_onroute() (#1059)

[Victor Seva]

```
(gdb) f 4
#4  0x00007fae32c3457e in dlg_onroute (req=0x7fae3def7ac8, route_params=0x7fad006e9b1e, 
    param=0x7fff717dab10) at dlg_handlers.c:1350
1350	dlg_handlers.c: No such file or directory.
(gdb) p dlg
$1 = (dlg_cell_t *) 0x7fad74f20258
(gdb) p *dlg
$2 = {ref = 1264713769, next = 0x7fad74e7aa78, prev = 0x7fad74f20288, h_id = 20, h_entry = 0, 
  state = 1962017437, lifetime = 32685, init_ts = 11, start_ts = 0, end_ts = 1734963823, 
  dflags = 1667457375, iflags = 1818321759, sflags = 1601332588, toroute = 1919251317, 
  toroute_name = {
    s = 0x3633323631393631 <error: Cannot access memory at address 0x3633323631393631>, 
    len = 1768189440}, from_rr_nb = 115, tl = {next = 0x38, prev = 0x0, timeout = 0}, callid = {
    s = 0x7fad00000000 <error: Cannot access memory at address 0x7fad00000000>, len = 890716088}, 
  from_uri = {s = 0x7fae3517bf90 <__FUNCTION__.15256> "rtpp_function_call", len = 890714464}, 
  to_uri = {s = 0x981 <error: Cannot access memory at address 0x981>, len = -252645136}, req_uri = {
    s = 0x7fad74f20380 "SDj02te01-da0287f0f142f9dac6bda3fd889f1592-06a7f50", len = 50}, tag = {{
      s = 0x7fad757740f8 "z9hG4bK41d6.cdcb6121b68837c41a117213d8d3d9a4.0", len = 46}, {
      s = 0x7fad74aa0688 "", len = 6742548}}, cseq = {{s = 0x0, len = 56}, {s = 0x0, len = 0}}, 
  route_set = {{s = 0x7fad00000000 <error: Cannot access memory at address 0x7fad00000000>, 
      len = 890720288}, {s = 0x7fae3517beeb <__FUNCTION__.6323> "shm_str_dup", len = 890714464}}, 
  contact = {{s = 0x2d3 <error: Cannot access memory at address 0x2d3>, len = -252645136}, {
      s = 0x30657432306a4453 <error: Cannot access memory at address 0x30657432306a4453>, 
      len = 1633955121}}, bind_addr = {0x3966323431663066, 0x3361646236636164}, cbs = {
    first = 0x3531663938386466, types = 808268345}, profile_links = 0x3035, vars = 0x48}
```

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