[PATCH] config.c: fix writing config files on Windows network shares

[Karsten Blees <karsten.blees@gmail.com>]

Renaming to an existing file doesn't work on Windows network shares if the
target file is open.

munmap() the old config file before commit_lock_file.

Signed-off-by: Karsten Blees <blees@dcon.de>
---

See https://github.com/git-for-windows/git/issues/226

Strangely, renaming to an open file works fine on local disks...

 config.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/config.c b/config.c
index 07133ef..3a23c11 100644
--- a/config.c
+++ b/config.c
@@ -2153,6 +2153,9 @@ int git_config_set_multivar_in_file(const char *config_filename,
 					  contents_sz - copy_begin) <
 			    contents_sz - copy_begin)
 				goto write_err_out;
+
+		munmap(contents, contents_sz);
+		contents = NULL;
 	}
 
 	if (commit_lock_file(lock) < 0) {
-- 
2.4.3.windows.1.1.g87477f9