[PATCH] Fix possible crash while verifying avdtp version

Hi,

Codenomicon a2dp tests makes bluetoothd to crash due to a malformed
sdp record (BlueZ 4.60):

Signal 11 (SIGSEGV)
0		avdtp_get_internal () at audio/avdtp.c:2073
1	0x00022f18	avdtp_confirm_cb (chan=0x6c0e0) at audio/avdtp.c:2266
2	0x0003a7dc	server_cb (user_data=0x6d380) at src/btio.c:193

-- 
Luiz Augusto von Dentz
Computer Engineer