detached-stash: simplify stash_drop
Previously, git stash drop would fail noisily while executing git reflog delete if the specified revision was not a stash reference. Now, git stash drop fails with an error message which more precisely indicates the reason for failure. Furthermore, git stash drop will now fail with a non-zero status code if stash@{n} specifies a stash log entry that does not actually exist. This change in behaviour is achieved by delegating argument parsing to the common parse_flags_and_rev() function (via a call to assert_stash_ref). Signed-off-by: NJon Seymour <jon.seymour@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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