[PATCH] libhal: validate parameter to be != NULL

[Danny Kukawka]

Hi,

this patch fixes fd.o bug #10133 and check several function
parameter for != NULL to aviod problems with D-Bus calls 
where e.g. given udi or key is NULL (it's at least the same
code as check for a valid LibHalContext).

Danny

 libhal.c |   80 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 libhal.h |   25 ++++++++++++++++
 2 files changed, 105 insertions(+)
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