submodule: drop unused prefix parameter from some functions

We stopped using the "prefix" parameter of
relocate_single_git_dir_into_superproject() and its callers in
202275b96b (submodule.c: get_super_prefix_or_empty, 2017-03-14), where
we switched to using the environment global directly.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/rm.c

@@ -61,7 +61,7 @@ static void print_error_files(struct string_list *files_list,
 	}
 }
 
-static void submodules_absorb_gitdir_if_needed(const char *prefix)
+static void submodules_absorb_gitdir_if_needed(void)
 {
 	int i;
 	for (i = 0; i < list.nr; i++) {
@@ -83,7 +83,7 @@ static void submodules_absorb_gitdir_if_needed(const char *prefix)
 			continue;
 
 		if (!submodule_uses_gitfile(name))
-			absorb_git_dir_into_superproject(prefix, name,
+			absorb_git_dir_into_superproject(name,
 				ABSORB_GITDIR_RECURSE_SUBMODULES);
 	}
 }
@@ -313,7 +313,7 @@ int cmd_rm(int argc, const char **argv, const char *prefix)
 	}
 
 	if (!index_only)
-		submodules_absorb_gitdir_if_needed(prefix);
+		submodules_absorb_gitdir_if_needed();
 
 	/*
 	 * If not forced, the file, the index and the HEAD (if exists)

builtin/submodule--helper.c

@@ -2107,8 +2107,7 @@ static int absorb_git_dirs(int argc, const char **argv, const char *prefix)
 		return 1;
 
 	for (i = 0; i < list.nr; i++)
-		absorb_git_dir_into_superproject(prefix,
-				list.entries[i]->name, flags);
+		absorb_git_dir_into_superproject(list.entries[i]->name, flags);
 
 	return 0;
 }

submodule.c

@@ -1910,7 +1910,7 @@ int submodule_move_head(const char *path,
 	if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
 		if (old_head) {
 			if (!submodule_uses_gitfile(path))
-				absorb_git_dir_into_superproject("", path,
+				absorb_git_dir_into_superproject(path,
 					ABSORB_GITDIR_RECURSE_SUBMODULES);
 		} else {
 			char *gitdir = xstrfmt("%s/modules/%s",
@@ -1997,8 +1997,7 @@ out:
  * Embeds a single submodules git directory into the superprojects git dir,
  * non recursively.
  */
-static void relocate_single_git_dir_into_superproject(const char *prefix,
-						      const char *path)
+static void relocate_single_git_dir_into_superproject(const char *path)
 {
 	char *old_git_dir = NULL, *real_old_git_dir = NULL, *real_new_git_dir = NULL;
 	const char *new_git_dir;
@@ -2040,8 +2039,7 @@ static void relocate_single_git_dir_into_superproject(const char *prefix,
  * having its git directory within the working tree to the git dir nested
  * in its superprojects git dir under modules/.
  */
-void absorb_git_dir_into_superproject(const char *prefix,
-				      const char *path,
+void absorb_git_dir_into_superproject(const char *path,
 				      unsigned flags)
 {
 	int err_code;
@@ -2082,7 +2080,7 @@ void absorb_git_dir_into_superproject(const char *prefix,
 		char *real_common_git_dir = real_pathdup(get_git_common_dir(), 1);
 
 		if (!starts_with(real_sub_git_dir, real_common_git_dir))
-			relocate_single_git_dir_into_superproject(prefix, path);
+			relocate_single_git_dir_into_superproject(path);
 
 		free(real_sub_git_dir);
 		free(real_common_git_dir);

submodule.h

@@ -141,8 +141,7 @@ void submodule_unset_core_worktree(const struct submodule *sub);
 void prepare_submodule_repo_env(struct argv_array *out);
 
 #define ABSORB_GITDIR_RECURSE_SUBMODULES (1<<0)
-void absorb_git_dir_into_superproject(const char *prefix,
-				      const char *path,
+void absorb_git_dir_into_superproject(const char *path,
 				      unsigned flags);
 
 /*