Fixes tags need work in the iio-fixes tree

[Thierry Reding]

In commit

  55bf748e4e1e ("iio: adc: mt6359: fix unchecked return value in mt6358_read_imp")

Fixes tag

  Fixes: 3587914bf61 ("iio: adc: Add support for MediaTek MT6357/8/9 Auxiliary ADC")

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").