btrfs: adjust message level for unrecognized mount option

An unrecognized option is a failure that should get user/administrator
attention, the info level is often below what gets logged, so make it
error.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 4969fcc..7932d8d 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -873,7 +873,7 @@
 			break;
 #endif
 		case Opt_err:
-			btrfs_info(info, "unrecognized mount option '%s'", p);
+			btrfs_err(info, "unrecognized mount option '%s'", p);
 			ret = -EINVAL;
 			goto out;
 		default: