git-tar-tree: Remove duplicate git_config() call

generate_tar() eventually calls write_tar_archive() which does all the
"real" work and which also calls git_config(git_tar_config).  We only
need to do this once.
Signed-off-by: NRene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

builtin-tar-tree.c

@@ -267,8 +267,6 @@ static int generate_tar(int argc, const char **argv, const char *prefix)
 	int result;
 	char *base = NULL;
 
-	git_config(git_tar_config);
-
 	memset(&args, 0, sizeof(args));
 	if (argc != 2 && argc != 3)
 		usage(tar_tree_usage);