avfilter/vf_signalstats: Use 64bit for processing histogram
The result might not fit into 32bit if an image has gigantic
dimensions and one of the planes has a dominant value
(particularly so if said value is big).
Fixes Coverity issues #1598399, #1598401, #1598402, #1598403, #1598404.
Signed-off-by:
Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
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