diff.c: adjust hash function signature to match hashmap expectation

This makes the follow up patch easier.
Signed-off-by: NStefan Beller <sbeller@google.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

diff.c

@@ -707,11 +707,15 @@ struct moved_entry {
 	struct moved_entry *next_line;
 };
 
-static int moved_entry_cmp(const struct diff_options *diffopt,
-			   const struct moved_entry *a,
-			   const struct moved_entry *b,
+static int moved_entry_cmp(const void *hashmap_cmp_fn_data,
+			   const void *entry,
+			   const void *entry_or_key,
 			   const void *keydata)
 {
+	const struct diff_options *diffopt = hashmap_cmp_fn_data;
+	const struct moved_entry *a = entry;
+	const struct moved_entry *b = entry_or_key;
+
 	return !xdiff_compare_lines(a->es->line, a->es->len,
 				    b->es->line, b->es->len,
 				    diffopt->xdl_opts);
@@ -5534,10 +5538,8 @@ static void diff_flush_patch_all_file_pairs(struct diff_options *o)
 		if (o->color_moved) {
 			struct hashmap add_lines, del_lines;
 
-			hashmap_init(&del_lines,
-				     (hashmap_cmp_fn)moved_entry_cmp, o, 0);
-			hashmap_init(&add_lines,
-				     (hashmap_cmp_fn)moved_entry_cmp, o, 0);
+			hashmap_init(&del_lines, moved_entry_cmp, o, 0);
+			hashmap_init(&add_lines, moved_entry_cmp, o, 0);
 
 			add_lines_to_move_detection(o, &add_lines, &del_lines);
 			mark_color_as_moved(o, &add_lines, &del_lines);