filters: ResizeLinearLF: Further optimalization
filters: ResizeLinearLF: Further optimalization

Optimize the inner loop further.

This reshuffles the multiplication and divisions saving a few
operations, which brings back the effectivity back as it was
before the precision fixes.

Signed-off-by: Cyril Hrubis <bfa353c6fcc62e9e30df14bd09318f5f40fff029@ucw.cz>

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