Fix memory leak

[Paxxi]

Description

Fixes a memory leak introduced with #17186 . I missed it but Coverity caught it 😄

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Clean up (non-breaking change which removes non-working, unmaintained functionality)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that will cause existing functionality to change)
• Cosmetic change (non-breaking change that doesn't touch code)
• None of the above (please explain below)

Checklist:

• My code follows the Code Guidelines of this project
• My change requires a change to the documentation, either Doxygen or wiki
• I have updated the documentation accordingly
• I have read the Contributing document
• I have added tests to cover my change
• All new and existing tests passed

[fritsch]

Thanks much.

[fuzzard]

Disregard this first comment.

Also st is created with new, with no corresponding delete as well in that method. Worth doing the delete for that as well?
https://github.com/Paxxi/xbmc/blob/542470e4f8ebc5ae60d52306e8740e7404f03a60/xbmc/cores/VideoPlayer/DVDDemuxers/DVDDemuxFFmpeg.cpp#L1508

[Paxxi]

@fuzzard , check the line below. stream is a pointer to base class and st is a pointer to the real class, stream is always assigned st directly after it's created.

One new early return was added that didn't delete stream and that's what coverity caught

[fuzzard]

Sorry for the noise