Updated patch, checks NULL return from malloc spotted by jhe

Frédéric Dalleau wrote:
> Dear all,
>
> I recently met an alignment trap in hcid.
> Some device sent me an sdp request and the answer had to be fragmented 
> because the device reception buffer was very small.
> After that i saw alignment trap.
> The last trace I saw was : Continuation state size: 8
> The trace is located at sdpd/request.c : static sdp_cont_state_t 
> *sdp_cstate_get(uint8_t *buffer)
> This function returns an unaligned pointer.
>
> I think this patch is ok, but it has never been tested, and possibly 
> other problems are hidden behind.
> Instead of returning an unaligned pointer, the patch allocates a buffer.
>
> To test it, i could build a bluez with small sdp reception buffer and 
> ask an arm to give me fragmented reply.
> This would save me some time if someone could tell me where to change 
> this value...
>
> BR,
> Frederic
>
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