fix off-by-one error: if file ends at block boundary, must go to next file; tar_next_block will take care of getting the next block
fix off-by-one error: if file ends at block boundary, must go to next file; tar_next_block will take care of getting the next block

wookietreiber/pixz,vasi/pixz,cicku/pixz,wookietreiber/pixz,cicku/pixz,vasi/pixz