9263fdb30e1dc2e6fdca95a553f116d350622910

16bit PNG images were not doing any conversions when saving linear float buffers, but would always load them as SRGB. apply the same method used for 16bit images from floats as used in jpeg2000.
fix issue reported in '[#33876] bpy.path.ensure_ext adds extension twice / extra period if filename empty, just a period or equal to extension'
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