Avoid array index out of bounds parsing dpkg-deb --info

The first line of "dpkg-deb -I" output has only 5 words:
  old Debian package, version 0.939000.
or
  new Debian package, version 2.0.

Examples:

$ wget http://archive.debian.org/debian/dists/Debian-0.93R6/binary/admin/acct-5-10.deb
$ LANG=C dpkg-deb -I acct-5-10.deb
 old Debian package, version 0.939000.
 size 18338 bytes: control archive=1064, main archive=17260.
      61 bytes,     3 lines      conffiles
     889 bytes,    20 lines      control
     570 bytes,    23 lines   *  postinst             #!/bin/sh
     107 bytes,     7 lines   *  postrm               #!/bin/sh
     212 bytes,    12 lines   *  preinst              #!/bin/sh
     212 bytes,    12 lines   *  prerm                #!/bin/sh
...

$ wget http://archive.debian.org/debian/dists/bo/main/binary-all/admin/alien_3.3.deb
$ LANG=C dpkg-deb -I alien_3.3.deb
 new Debian package, version 2.0.
 size 20748 bytes: control archive=850 bytes.
     394 bytes,    11 lines      control
     785 bytes,    13 lines      md5sums

Author: rbuj

src/fr-command-dpkg.c

@@ -51,7 +51,7 @@ process_metadata_line (char      *line,
 
         g_return_if_fail (line != NULL);
 
-        fields = split_line (line, 6);
+        fields = split_line (line, 5);
         if (!fields[1] || !g_str_equal (fields[1], "bytes,")) {
                 g_strfreev (fields);
                 return;
@@ -60,7 +60,9 @@ process_metadata_line (char      *line,
         fdata = file_data_new ();
         fdata->size = g_ascii_strtoull (fields[0], NULL, 10);
 
-        if (fields[5] && g_str_equal (fields[4],"*")) {
+        if (g_str_equal (fields[4],"*")) {
+                g_strfreev (fields);
+                fields = split_line (line, 6);
                 name = g_strdup (fields[5]);
         } else {
                 name = g_strdup (get_last_field (line, 5));