gst/tcp/gstfdset.c: Make sure the pollfds are not changed when the poll call is runni...

gst/tcp/gstfdset.c: Make sure the pollfds are not changed when the poll call is running. Protect against array out of...

Original commit message from CVS:
* gst/tcp/gstfdset.c: (ensure_size), (gst_fdset_new),
(gst_fdset_add_fd), (gst_fdset_remove_fd),
(gst_fdset_fd_has_closed), (gst_fdset_fd_has_error),
(gst_fdset_fd_can_read), (gst_fdset_fd_can_write),
(gst_fdset_wait):
Make sure the pollfds are not changed when the poll call is
running. Protect against array out of bounds.