Backport of "rmdemux: add some integer overflow checks" into 1.20
Backport of !5072 (merged) "rmdemux: add some integer overflow checks".
Commits:
- 763d2bb4 rmdemux: Use GST_LOG_OBJECT instead of GST_LOG
- b268b27c rmdemux: Check for integer overflows when calculating the size of SIPR audio buffers
- aca056b0 rmdemux: Check that enough SIPR audio data is available when copying
- d8d83ad4 rmdemux: Use GST_LOG_OBJECT instead of GST_LOG
- 67e38cf4 rmdemux: Check for integer overflow when calculation audio packet size