dm thin metadata: remove needless newline from subtree_dec() DMERR message

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c
index f962d64..dc947f5 100644
--- a/drivers/md/dm-thin-metadata.c
+++ b/drivers/md/dm-thin-metadata.c
@@ -344,7 +344,7 @@
 	memcpy(&root_le, value, sizeof(root_le));
 	root = le64_to_cpu(root_le);
 	if (dm_btree_del(info, root))
-		DMERR("btree delete failed\n");
+		DMERR("btree delete failed");
 }
 
 static int subtree_equal(void *context, const void *value1_le, const void *value2_le)