[PATCH] Apply N -> A status change in diff-helper

When the git diff status 'N' was changed to 'A', diff-helper.c was
not updated accordingly.  This means that it no longer shows the
diff for newly added files.

This patch makes that change in diff-helper.c.
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

diff-helper.c

@@ -91,7 +91,7 @@ int main(int ac, const char **av) {
 			if (*cp++ != ' ')
 				break;
 			status = *cp++;
-			if (!strchr("MCRNDU", status))
+			if (!strchr("AMCRDU", status))
 				break;
 			two_paths = score = 0;
 			if (status == DIFF_STATUS_RENAMED ||