merge-ort: drop unused "opt" parameter from merge_check_renames_reusable()

The merge_options parameter has never been used since the function was
introduced in 64aceb6 (merge-ort: add code to check for whether
cached renames can be reused, 2021-05-20). In theory some merge options
might impact our decisions here, but that has never been the case so
far.

Let's drop it to appease -Wunused-parameter; it would be easy to add
back later if we need to (there is only one caller).

Signed-off-by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: peff

merge-ort.c

@@ -4880,8 +4880,7 @@ static void merge_start(struct merge_options *opt, struct merge_result *result)
 	trace2_region_leave("merge", "allocate/init", opt->repo);
 }
 
-static void merge_check_renames_reusable(struct merge_options *opt,
-					 struct merge_result *result,
+static void merge_check_renames_reusable(struct merge_result *result,
 					 struct tree *merge_base,
 					 struct tree *side1,
 					 struct tree *side2)
@@ -5083,7 +5082,7 @@ void merge_incore_nonrecursive(struct merge_options *opt,
 
 	trace2_region_enter("merge", "merge_start", opt->repo);
 	assert(opt->ancestor != NULL);
-	merge_check_renames_reusable(opt, result, merge_base, side1, side2);
+	merge_check_renames_reusable(result, merge_base, side1, side2);
 	merge_start(opt, result);
 	/*
 	 * Record the trees used in this merge, so if there's a next merge in