Return boolean from db_populate

Since the number of packages is not used anywhere, just return a
boolean to avoid the implicit cast from size_t to int in be_local.c.
Use 0 as success to be consistent with db_validate.

Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

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