return, not next, from eval BLOCK

return, not next, from eval BLOCK

Per perldoc eval, exiting an eval BLOCK is not allowed. And it generates
warnings - 37,000 of them in one day - on a system on which the fine
generator runs every 15 minutes. Simply returning from the block
achieves the same goal without generating scads of warnings.

Signed-off-by: Dan Scott <dscott@laurentian.ca>