rebase: do not print lots of usage hints after an obvious error message
rebase: do not print lots of usage hints after an obvious error message

When a non-existent branch was specified to be rebased, the complete
usage information is printed after the error message that carries the
relevant piece of information:

   $ git rebase master topci
   fatal: no such branch: topci
   usage: git rebase [-i] [options] [--onto <newbase>] [<upstream>] [<branch>]
      or: git rebase [-i] [options] --onto <newbase> --root [<branch>]
      or: git-rebase [-i] --continue | --abort | --skip

   Available options are
   [30 lines of usage stripped]

The error message was introduced recently by 4ac5356c (rebase: give a
better error message for bogus branch, 2011-01-27), and the result was
acceptable because the usage text was just two lines. But 45e2acf3
(rebase: define options in OPTIONS_SPEC, 2011-02-28) made things worse
because the usage text is now 35 lines.

Just drop the usage information because it does not add value to the
error message.

Signed-off-by: Johannes Sixt <fd432345609ae4d58c1aa629cb66ba96d1391622@kdbg.org>
Acked-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