[PATCH/POC 5/7] setup.c: reduce cleanup sites in setup_explicit_git_dir()

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 setup.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/setup.c b/setup.c
index 43f56fb..dfe9d08 100644
--- a/setup.c
+++ b/setup.c
@@ -388,16 +388,13 @@ static const char *setup_explicit_git_dir(const char *gitdirenv,
 	if (!is_git_directory(gitdirenv)) {
 		if (nongit_ok) {
 			*nongit_ok = 1;
-			free(gitfile);
-			return NULL;
+			goto done_null;
 		}
 		die("Not a git repository: '%s'", gitdirenv);
 	}
 
-	if (check_repository_format_gently(gitdirenv, nongit_ok)) {
-		free(gitfile);
-		return NULL;
-	}
+	if (check_repository_format_gently(gitdirenv, nongit_ok))
+		goto done_null;
 
 	/* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
 	if (work_tree_env)
@@ -408,8 +405,7 @@ static const char *setup_explicit_git_dir(const char *gitdirenv,
 
 		/* #18, #26 */
 		set_git_dir(gitdirenv);
-		free(gitfile);
-		return NULL;
+		goto done_null;
 	}
 	else if (git_work_tree_cfg) { /* #6, #14 */
 		if (is_absolute_path(git_work_tree_cfg))
@@ -430,8 +426,7 @@ static const char *setup_explicit_git_dir(const char *gitdirenv,
 	else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
 		/* #16d */
 		set_git_dir(gitdirenv);
-		free(gitfile);
-		return NULL;
+		goto done_null;
 	}
 	else /* #2, #10 */
 		set_git_work_tree(".");
@@ -442,8 +437,7 @@ static const char *setup_explicit_git_dir(const char *gitdirenv,
 	/* both get_git_work_tree() and cwd are already normalized */
 	if (!strcmp(cwd, worktree)) { /* cwd == worktree */
 		set_git_dir(gitdirenv);
-		free(gitfile);
-		return NULL;
+		goto done_null;
 	}
 
 	offset = dir_inside_of(cwd, worktree);
@@ -459,6 +453,8 @@ static const char *setup_explicit_git_dir(const char *gitdirenv,
 
 	/* cwd outside worktree */
 	set_git_dir(gitdirenv);
+
+done_null:
 	free(gitfile);
 	return NULL;
 }
-- 
1.8.5.1.77.g42c48fa