mke2fs: fix handling of mmp_update_interval option

Make sure the s_mmp_update_interval super block field is set
from the file system parameters block which is passed into the
ext2fs_initialize() function.

Addresses-Lustre-Bug: LU-1888

Signed-off-by: Gregoire Pichon <gregoire.pichon@bull.net>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/lib/ext2fs/initialize.c b/lib/ext2fs/initialize.c
index 3567722..b0c15d2 100644
--- a/lib/ext2fs/initialize.c
+++ b/lib/ext2fs/initialize.c
@@ -241,6 +241,8 @@
 		goto cleanup;
 	}
 
+	set_field(s_mmp_update_interval, 0);
+
 	/*
 	 * If we're creating an external journal device, we don't need
 	 * to bother with the rest.