stash: simplify parsing fixes
This patch simplifies Brian's fix for the recent regression by: * eliminating the extra loop * eliminating use of git rev-parse for parsing flags * making use of the for opt idiom for the retained loop * eliminating the redundant -- case The patch has been tested with the tests in current maint. Signed-off-by: NJon Seymour <jon.seymour@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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