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Switch Coverity-only code to assert (CID #1619299) #5441

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fr_nbo_from_uint64v() does not have an error return--it doesn't need one. The buffers are big enough, the | 0x80 means it will always use as least one byte, so fr_high_bit_pos() won't return 0 even if num == 0. So adding a bogus error return check for Coverity actually misleads Coverity about any call to fr_nbo_from_uint64v(), making it the probable cause of the CID.

fr_nbo_from_uint64v() does not have an error return--it doesn't
need one. The buffers are big enough, the "| 0x80" means it will
always use as least one byte, so fr_high_bit_pos() won't return 0
even if num == 0. So adding a bogus error return check for Coverity
actually misleads Coverity about any call to fr_nbo_from_uint64v(),
making it the probable cause of the CID.
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