diff-delta.c: Fix broken skip calculation.
diff-delta.c: Fix broken skip calculation.

A particularly bad case was HASH_LIMIT <= hash_count[i] < 2*HASH_LIMIT:
in that case, only a single hash survived.  For larger cases,
2*HASH_LIMIT was the actual limiting value after pruning.

Signed-off-by: David Kastrup <c681202ddb1f18e2264c65f066975436b868c74d@gnu.org>
Acked-by: Nicolas Pitre <d659c10e27d52b00987b65e85d99bce5480adcae@cam.org>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git