[PATCH] add udi and some more checks to libhal

[Danny Kukawka]

Hi,

this patch adds:
* a minimal check if a given UDI is valid (checks if the UDI starts 
with '/org/freedesktop/Hal/devices/'). This should prevent possible 
(application) crashes if a invalid UDI is send to HAL and reduce unneeded 
dbus calls.
* some more parameter checks (for LibHalChangeSet, keys ...)

Please review,

Danny

 libhal.c |  168 ++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 117 insertions(+), 51 deletions(-)

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