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lib: Add better guard against huge malloc

Bastien Nocera requested to merge wip/hadess/rhbz1656518 into master

See dda6857f and https://bugzilla.redhat.com/show_bug.cgi?id=1656518

When the number of lines to assemble is 1, the median_filter() function would be passed -1 as its size as it was calculated with: (num_lines / 2) - 1 so (1 / 2) - 1 = 0 - 1 = -1

Add a guard to stop drivers trying to assemble single lines. This doesn't however fix the vfs5011 driver that tried to do that.

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