init-db: check extra arguments and complain.

"git-init-db junk" does not complain but just ignores "junk".
Die with the usage string in such a case.

Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/init-db.c b/init-db.c
index 8195b68..ead37b5 100644
--- a/init-db.c
+++ b/init-db.c
@@ -237,9 +237,7 @@
 
 	for (i = 1; i < argc; i++, argv++) {
 		char *arg = argv[1];
-		if (arg[0] != '-')
-			break;
-		else if (!strncmp(arg, "--template=", 11))
+		if (!strncmp(arg, "--template=", 11))
 			template_dir = arg+11;
 		else
 			die(init_db_usage);