fix(rust): Remove dead code returning pointer to stack variable

[cfsmp3]

Summary

Removes unused impl FromCType<*mut PMT_entry> for *mut PMTEntry which contained a critical bug: returning a pointer to a stack-allocated value (undefined behavior).

Problem

The deleted code did this:

let mut pmt_entry = PMTEntry { ... };
Some(&mut pmt_entry as *mut PMTEntry)  // BUG: dangling pointer!

When the function returns, pmt_entry is destroyed and the pointer becomes dangling.

Why delete instead of fix?

This code was never called anywhere in the codebase:

• The actual usage in demuxer.rs:279 uses the value-returning variant: PMTEntry::from_ctype(*buffer_ptr)
• That call site already wraps it properly: Box::into_raw(Box::new(PMTEntry::from_ctype(...)?))

Rather than fix dead buggy code (and introduce memory ownership complexity), just delete it.

Verification

• Build passes ✓
• All 265 Rust tests pass ✓
• No code references this implementation

Related

Supersedes #1988 which attempted to fix this bug rather than delete the dead code.

🤖 Generated with Claude Code

[ccextractor-bot]

CCExtractor CI platform finished running the test files on linux. Below is a summary of the test results, when compared to test for commit 618df18...:

Report Name	Tests Passed
Broken	13/13
CEA-708	14/14
DVB	6/7
DVD	3/3
DVR-MS	2/2
General	27/27
Hardsubx	1/1
Hauppage	3/3
MP4	3/3
NoCC	10/10
Options	85/86
Teletext	21/21
WTV	13/13
XDS	34/34

NOTE: The following tests have been failing on the master branch as well as the PR:

• ccextractor --autoprogram --out=srt --latin1 --quant 0 85271be4d2..., Last passed:

  Test 7742

• ccextractor --out=spupng c83f765c66..., Last passed:

  Test 7742

This PR does not introduce any new test failures. However, some tests are failing on both master and this PR (see above).

Check the result page for more info.

[ccextractor-bot]

CCExtractor CI platform finished running the test files on windows. Below is a summary of the test results, when compared to test for commit 618df18...:

Report Name	Tests Passed
Broken	13/13
CEA-708	14/14
DVB	6/7
DVD	3/3
DVR-MS	2/2
General	25/27
Hardsubx	1/1
Hauppage	3/3
MP4	3/3
NoCC	10/10
Options	81/86
Teletext	21/21
WTV	13/13
XDS	34/34

NOTE: The following tests have been failing on the master branch as well as the PR:

• ccextractor --autoprogram --out=srt --latin1 --quant 0 85271be4d2..., Last passed:

  Test 7743

• ccextractor --autoprogram --out=ttxt --latin1 --ucla dab1c1bd65..., Last passed:

  Test 7743

• ccextractor --out=srt --latin1 --autoprogram 29e5ffd34b..., Last passed:

  Test 7743

• ccextractor --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9..., Last passed:

  Test 7743

• ccextractor --startcreditsnotbefore 1 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9..., Last passed:

  Test 7743

• ccextractor --startcreditsnotafter 2 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9..., Last passed:

  Test 7743

• ccextractor --startcreditsforatleast 1 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9..., Last passed:

  Test 7743

• ccextractor --startcreditsforatmost 2 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9..., Last passed:

  Test 7743

This PR does not introduce any new test failures. However, some tests are failing on both master and this PR (see above).

Check the result page for more info.