avfilter/vf_unsharp: Don't dereference NULL
The unsharp filter uses an array of arrays of uint32_t, each of which is separately allocated. These arrays also need to freed separately; but before doing so, one needs to check whether the array of arrays has actually been allocated, otherwise one would dereference a NULL pointer. This fixes #8408. Furthermore, the array of arrays needs to be zero-initialized so that no uninitialized pointer will be freed in case an allocation of one of the individual arrays fails. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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