bluez_helper: ignore non xml lines

[User65k]

Hi,
I ran into a problem while trying to dump MAP data from android.
This was due to non XML Data at the end of sdptool. (It seems to search two times.)

sdptool search --xml --bdaddr=xx:xx:xx:xx:xx:xx map
Searching for map on xx:xx:xx:xx:xx:xx ...
<?xml version="1.0" encoding="UTF-8" ?>

<record>
	[...]
</record>
Searching for map on xx:xx:xx:xx:xx:xx ...
Service Search failed: Invalid argument

[sultanqasim]

I just encountered this behaviour today on one of my test devices. I'll bring in a variation of your change.

[sultanqasim]

Fixed