Fixes tags need work in the perf tree

[Mark Brown]

In commit

  841dbf4871c57 ("perf loongarch: Fix build failure with CONFIG_LIBDW_DWARF_UNWIND")

Fixes tag

  Fixes: e62fae9d9e8 ("perf unwind-libdw: Fix a cross-arch unwinding bug")

has these problem(s):

  - SHA1 should be at least 12 digits long
    This can be fixed for the future by setting core.abbrev to 12 (or
    more) or (for git v2.11 or later) just making sure it is not set
    (or set to "auto").

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