[PATCH v5 5/7] grep.c: don't pass along NULL callback value

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

Change grep_cmd_config() to stop passing around the always-NULL "cb"
value. When this code was added in 7e8f59d577e (grep: color patterns
in output, 2009-03-07) it was non-NULL, but when that changed in
15fabd1bbd4 (builtin/grep.c: make configuration callback more
reusable, 2012-10-09) this code was left behind.

In a subsequent change I'll start using the "cb" value, this will make
it clear which functions we call need it, and which don't.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 builtin/grep.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/builtin/grep.c b/builtin/grep.c
index d85cbabea67..5ec4cecae45 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -285,8 +285,8 @@ static int wait_all(void)
 
 static int grep_cmd_config(const char *var, const char *value, void *cb)
 {
-	int st = grep_config(var, value, cb);
-	if (git_color_default_config(var, value, cb) < 0)
+	int st = grep_config(var, value, NULL);
+	if (git_color_default_config(var, value, NULL) < 0)
 		st = -1;
 
 	if (!strcmp(var, "grep.threads")) {
-- 
2.34.1.1146.gb52885e7c44