diff.c: add "const" qualifier to "char *cmd" member of "struct ll_diff_driver"

Also use "git_config_string" to simplify code where "cmd" is set.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/diff.c b/diff.c
index ed41ce418ee88894f9a3870a1c59eef8ee7baf31..f082f55bc524dae92c8d57fe0dc9e9c8e3f2d59a 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -57,7 +57,7 @@ static int parse_diff_color_slot(const char *var, int ofs)
 static struct ll_diff_driver {
        const char *name;
        struct ll_diff_driver *next;
-       char *cmd;
+       const char *cmd;
 } *user_diff, **user_diff_tail;
 
 /*
@@ -86,10 +86,7 @@ static int parse_lldiff_command(const char *var, const char *ep, const char *val
                user_diff_tail = &(drv->next);
        }
 
-       if (!value)
-               return config_error_nonbool(var);
-       drv->cmd = xstrdup(value);
-       return 0;
+       return git_config_string(&(drv->cmd), var, value);
 }
 
 /*