Btrfs: fix memory leak in btrfs_parse_early_options()

Don't leak subvol_name string in case multiple subvol= options are
given.  "The lastest option is effective" behavior (consistent with
subvolid= and subvolrootid= options) is preserved.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index dcd5aef..6befcaf 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -448,6 +448,7 @@
 		token = match_token(p, tokens, args);
 		switch (token) {
 		case Opt_subvol:
+			kfree(*subvol_name);
 			*subvol_name = match_strdup(&args[0]);
 			break;
 		case Opt_subvolid: