Yes it is perfectly acceptable. Most roofers will hold the ridge vent back from the ends of the ridge just so the roof is easier to seal at the ends. I have a hip roof on one end of my home and a straight gable end on the other. The gable end actually has a 2-4 foot soffit that I thought should be vented as well, though the roofers say it isn't needed since there is no heat and humidity built up in the overhanging soffit. I did it anyway just to maintain a somewhat symmetrical appearance on the roof.
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