[PATCH BlueZ v1] hciemu: Fix crash if hciemu_client_new return NULL

[Luiz Augusto von Dentz <luiz.dentz@gmail.com>]

From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

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)
---
 emulator/hciemu.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/emulator/hciemu.c b/emulator/hciemu.c
index 01a8e80b727e..bff92286ed45 100644
--- a/emulator/hciemu.c
+++ b/emulator/hciemu.c
@@ -435,7 +435,9 @@ struct hciemu *hciemu_new_num(enum hciemu_type type, uint8_t num)
 
 		if (!client) {
 			queue_destroy(hciemu->clients, hciemu_client_destroy);
-			break;
+			queue_destroy(hciemu->post_command_hooks, NULL);
+			free(hciemu);
+			return NULL;
 		}
 
 		queue_push_tail(hciemu->clients, client);
-- 
2.53.0