Revert "lstat_cache(): print a warning if doing ping-pong between cache types"

Revert "lstat_cache(): print a warning if doing ping-pong between cache types"

This reverts commit 7734f04873cfaddd0b148074a633f1f824fd961f.

I guess that the reverted commit, 7734f048, has been in test long
enough, and should now be reverted.  I have not received any info
regarding any debug output of the reverted commit, so lets hope that
the lstat_cache() function do not cause any ping-pong.

Signed-off-by: Kjetil Barvik <barvik@broadpark.no>
Signed-off-by: Junio C Hamano <gitster@pobox.com>