avoid "defined but not used" warning for fetch_objs_via_walker
avoid "defined but not used" warning for fetch_objs_via_walker

Because this function is static and used only by the
http-walker, when NO_CURL is defined, gcc emits a "defined
but not used" warning.

Signed-off-by: Jeff King <696e3fbcf235d40b6ea1ebd61c87cbea79d444e7@peff.net>
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