[PATCH] add more parameter checks to libhal

[Danny Kukawka]

Hi,

this patch adds some more parameter check to some of the libhal functions to 
avoid possible trouble (e.g. in libhal_free_property_set()).

Danny

 libhal.c |   61 ++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 53 insertions(+), 8 deletions(-)
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