staging/lustre/llite: Fix obd name after c&p error

commit 95745e9b ("staging: lustre: Use kasprintf.") introduced
a copy and paste error causing two different obd types to be assigned
same content causing lustre to fail on mount with a warning from procfs
followed by a bizzare error about OST not having enough MDS
capabilities.

This patch unbreaks Lustre client again.
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
CC: Navya Sri Nizamkari <navyasri.tech@gmail.com>
CC: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/llite/llite_lib.c

@@ -983,7 +983,7 @@ int ll_fill_super(struct super_block *sb, struct vfsmount *mnt)
 		goto out_free;
 	}
 
-	md = kasprintf(GFP_NOFS, "%s-%p", lprof->lp_dt, cfg->cfg_instance);
+	md = kasprintf(GFP_NOFS, "%s-%p", lprof->lp_md, cfg->cfg_instance);
 	if (!md) {
 		err = -ENOMEM;
 		goto out_free;