merge-recursive: rename merge_options argument from 'o' to 'opt'
The name 'o' was used for the merge_options struct pointer taken by many functions, but in a few places it was named 'opt'. Several functions that didn't need merge_options instead used 'o' for a diff_filespec argument or local. Some functions needed both an inconsistently either renamed the merge_options to 'opt' or the diff_filespec to 'one'. I want to remove the weird split in the codebase between using a diff_filespec and a pair of (oid,mode) values in favor of using a diff_filespec everywhere, but that dramatically increases the number of cases where we want to use 'o' as a diff_filespec. Rename the merge_options argument to 'opt' to make room. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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