cmd_repack(): remove redundant local variable "nr_packs"
cmd_repack(): remove redundant local variable "nr_packs"

Its value is the same as the number of entries in the "names"
string_list, so just use "names.nr" in its place.

Signed-off-by: Michael Haggerty <c24c152f145c57791e809b126db9e61bd1c1782d@alum.mit.edu>
Acked-by: Stefan Beller <42740f1721ea98c94a07c13b76c86023ff11da2d@googlemail.com>
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