[PATCH] builtin-config: Fix crash when using "-f <relative path>" from non-root dir

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When your current directory is not at the root of the working tree, and you
use the "-f" option with a relative path, the current code segfaults since
argv has already been parsed, and argv[2] is now is a NULL pointer.
This patch replaces the incorrect argv[2] with the variable holding the
given config file name.

The bug was introduced by d64ec16... (git config: reorganize to use parseopt).

Signed-off-by: Johan Herland <johan@xxxxxxxxxxx>
---

This is probably v1.7.0 material, and maybe even suitable for 'maint'.
AFAICS, d64ec16... has been with us since before v1.6.3-rc0.

...Johan


 builtin-config.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/builtin-config.c b/builtin-config.c
index 2e3ef91..4bc46b1 100644
--- a/builtin-config.c
+++ b/builtin-config.c
@@ -358,7 +358,7 @@ int cmd_config(int argc, const char **argv, const char *unused_prefix)
 		if (!is_absolute_path(given_config_file) && prefix)
 			config_exclusive_filename = prefix_filename(prefix,
 								    strlen(prefix),
-								    argv[2]);
+								    given_config_file);
 		else
 			config_exclusive_filename = given_config_file;
 	}
-- 
1.6.6.rc2.5.g49666
-- 
Johan Herland, <johan@xxxxxxxxxxx>
www.herland.net
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