plperlng - plperlng: corrected hsh key count optimization from Abhijit

Log Message:
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corrected hsh key count optimization from Abhijit Menon-Sen
(tested this time)

Modified Files:
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plperlng:
plperl.c (r1.6 -> r1.7)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plperlng/plperlng/plperl.c.diff?r1=1.6&r2=1.7)