Merge branch 'jc/format-patch-error-check'
authorJunio C Hamano <gitster@pobox.com>
Tue, 16 Apr 2019 10:28:06 +0000 (19:28 +0900)
committerJunio C Hamano <gitster@pobox.com>
Tue, 16 Apr 2019 10:28:06 +0000 (19:28 +0900)
"git format-patch" used overwrite an existing patch/cover-letter
file.  A new "--no-clobber" option stops it.

* jc/format-patch-error-check:
  format-patch: notice failure to open cover letter for writing
  builtin/log: downcase the beginning of error messages


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