Paul Menzel authored Dec 04, 2013 and Jean-Baptiste Kempf committed Dec 29, 2013

The static analyzer from LLVM/Clang 1:3.4~svn194079-1 reports a possible
allocation of size 0 in `libdvdread/src/ifo_read.c`.

        $ scan-build -o scan-build make
        $ scan-view scan-build/2013-11-18-155601-16168-1

When `vts_ptt_srpt->nr_of_srpts` is zero the allocation size is zero.

        vts_ptt_srpt->title = malloc(vts_ptt_srpt->nr_of_srpts * sizeof(ttu_t));

The manual of the function `malloc` writes the following.

        If size is 0, then malloc() returns either NULL, or a unique
        pointer value that can later be successfully passed to free().

So check for 0 and, if it is, abort by going to the label `fail`.