[PATCH 1/3] make_absolute_path: return the input path if it points to our buffer

["Carlos Martín Nieto" <cmn@elego.de>]

Some codepaths call make_absolute_path with its own return value as
input. In such a cases, return the path immediately.

This fixes a valgrind-discovered error, whereby we tried to copy a
string onto itself.

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>
---
 abspath.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/abspath.c b/abspath.c
index 91ca00f..ff14068 100644
--- a/abspath.c
+++ b/abspath.c
@@ -24,6 +24,10 @@ const char *make_absolute_path(const char *path)
 	char *last_elem = NULL;
 	struct stat st;
 
+	/* We've already done it */
+	if (path == buf || path == next_buf)
+		return path;
+
 	if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
 		die ("Too long path: %.*s", 60, path);
 
-- 
1.7.4.1