[Dovecot] deliver: select destination folder

Hello,

I wanted a commandline switch within deliver to select the destination
folder within an IMAP account, so I added the -f switch, heres the diff,
the implementation is only "proof of concept" hehe, I didnt checked if
theres any security riscs in doing this. Could we add something like this
to dovecot?

diff deliver.c.orig deliver.c 342c342 < const char *destination, *mail;

  const char *destination, *mail, *folder;

355a356

  folder = NULL;

364a366,373

          } else if (strcmp(argv[i], "-f") == 0) {
                  /* destination folder */
                  i++;
                  if (i == argc) {
                          i_fatal_status(EX_USAGE,
                                         "Missing folder argument");
                  }
                  folder = argv[i];

378a388,391

  if (folder == NULL) {
          folder = "INBOX";
  }

449c462 < if (save_mail(storage, "INBOX", input) < 0)

  if (save_mail(storage, folder, input) < 0)

bye! Dominik