uma: Fix handling of reserves in zone_import()

uma: Fix handling of reserves in zone_import()

Kegs with no items reserved have uk_reserve = 0.  So the check
keg->uk_reserve >= dom->ud_free_items will be true once all slabs are
depleted.  Then, rather than go and allocate a fresh slab, we return to
the cache layer.

The intent was to do this only when the keg actually has a reserve, so
modify the check to verify this first.  Another approach would be to
make uk_reserve signed and set it to -1 until uma_zone_reserve() is
called, but this requires a few casts elsewhere.

Fixes:	1b2dcc8c54a8 ("uma: Avoid depleting keg reserves when filling a bucket")
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D32516