unexpected "unresolved merge conflict" for a new file

Hi,
`git commit' fails on a newly added file with the following
*
* You have some suspicious patch lines:
*
* In Documentation/core-api/gfp_mask-from-fs-io.rst
* unresolved merge conflict (line 27)
Documentation/core-api/gfp_mask-from-fs-io.rst:27:=======

$ git status --porcelain A Documentation/core-api/gfp_mask-from-fs-io.rst

$ git --version git version 2.17.0

from debian.

Btw. the suspicious line is $ sed -n '27p' Documentation/core-api/gfp_mask-from-fs-io.rst =======

I believe this is a bug because a new file cannot have a conflict by definition and also there are no <<<<< in the file so there is no unresolved conflict there. So I guess the heuristic should be more clever.

Thanks!