path.c: rename vsnpath() to do_git_path()

The name vsnpath() gives an impression that this is general path
handling function. It's not. This is the underlying implementation of
git_path(), git_pathdup() and strbuf_git_path() which will prefix
$GIT_DIR in the result string.
Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

path.c

@@ -60,7 +60,7 @@ char *mksnpath(char *buf, size_t n, const char *fmt, ...)
 	return cleanup_path(buf);
 }
 
-static void vsnpath(struct strbuf *buf, const char *fmt, va_list args)
+static void do_git_path(struct strbuf *buf, const char *fmt, va_list args)
 {
 	const char *git_dir = get_git_dir();
 	strbuf_addstr(buf, git_dir);
@@ -74,7 +74,7 @@ void strbuf_git_path(struct strbuf *sb, const char *fmt, ...)
 {
 	va_list args;
 	va_start(args, fmt);
-	vsnpath(sb, fmt, args);
+	do_git_path(sb, fmt, args);
 	va_end(args);
 }
 
@@ -83,7 +83,7 @@ char *git_pathdup(const char *fmt, ...)
 	struct strbuf path = STRBUF_INIT;
 	va_list args;
 	va_start(args, fmt);
-	vsnpath(&path, fmt, args);
+	do_git_path(&path, fmt, args);
 	va_end(args);
 	return strbuf_detach(&path, NULL);
 }
@@ -114,7 +114,7 @@ const char *git_path(const char *fmt, ...)
 	struct strbuf *pathname = get_pathname();
 	va_list args;
 	va_start(args, fmt);
-	vsnpath(pathname, fmt, args);
+	do_git_path(pathname, fmt, args);
 	va_end(args);
 	return pathname->buf;
 }