When some error happens when trying to search for parent subvolume
then parent_subvol will contain errno so don't try to free that
Crash backtrace would look like:
0 process_snapshot at cmds/receive.c:358
358 free(parent_subvol->path);
1 0x00005646898aaa67 in read_and_process_cmd at common/send-stream.c:348
2 btrfs_read_and_process_send_stream at common/send-stream.c:525
3 0x00005646898c9b8b in do_receive at cmds/receive.c:1113
4 cmd_receive at cmds/receive.c:1316
5 0x00005646898750b1 in cmd_execute at cmds/commands.h:125
6 main at btrfs.c:405
(gdb) p parent_subvol
$1 = (struct subvol_info *) 0xfffffffffffffffe
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Dāvis Mosāns <davispuh@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>
07320bd20f