Matthew Waters c2ac57f6c9 subparse: don't try to index string with -1
If the len of the string turns out to be 0, str[len - 1] resolved to
str[-1] which is not a good idea.

Fixes: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=46543
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2147>
2022-04-10 10:57:08 +10:00
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