[bluez/bluez] fae0c7: hciemu: Fix crash if hciemu_client_new return NULL

[bluez/bluez] fae0c7: hciemu: Fix crash if hciemu_client_new return NULL

[Luiz Augusto von Dentz]

  Branch: refs/heads/1090113
  Home:   https://github.com/bluez/bluez
  Commit: fae0c76f643a6d9c925998a29e3b25baa0b79ce8
      https://github.com/bluez/bluez/commit/fae0c76f643a6d9c925998a29e3b25baa0b79ce8
  Author: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
  Date:   2026-05-05 (Tue, 05 May 2026)

  Changed paths:
    M emulator/hciemu.c

  Log Message:
  -----------
  hciemu: Fix crash if hciemu_client_new return NULL

The following crahs can be observed if hciemu_client_new fails:

 Invalid read of size 8
   at 0x12DA79: queue_get_entries (queue.c:356)
   by 0x118434: hciemu_get_client (hciemu.c:277)
   by 0x1184A3: hciemu_client_get_host (hciemu.c:301)
   by 0x11536B: setup_powered_common (l2cap-tester.c:1452)
   by 0x11568E: setup_powered_client (l2cap-tester.c:1491)
   by 0x1324C6: setup_callback (tester.c:500)
   by 0x48A304D: g_main_context_dispatch (in /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6400.6)
   by 0x48A33FF: ??? (in /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6400.6)
   by 0x48A36F2: g_main_loop_run (in /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6400.6)
   by 0x133868: mainloop_run (mainloop-glib.c:65)
   by 0x133C9F: mainloop_run_with_signal (mainloop-notify.c:196)
   by 0x13325F: tester_run (tester.c:1085)
  Address 0x4c1e388 is 8 bytes inside a block of size 32 free'd
   at 0x483CA3F: free (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
   by 0x1187BF: hciemu_new_num (hciemu.c:437)



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