drm/amd/display: set new_stream to NULL after release

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-68236 · Microsoft / collected KEV context

cve-program · CVE-2026-68236

• https://git.kernel.org/stable/c/92b7c6e3a1546c6db868b07e93fa6fb950d1d3a0
• https://git.kernel.org/stable/c/bf9c06c70f496f1ba4474caf95c69696c828340e
• https://git.kernel.org/stable/c/01ba5b36898d6258f584269537cc49e7b05cf7c6
• https://git.kernel.org/stable/c/ba8bf1dcbb44773e7a0fd13b42925c644e0d5e76
• https://git.kernel.org/stable/c/5182e442e61397d446c36995b8f5676942d35b82
• https://git.kernel.org/stable/c/679f23f0a3606afcef1ffabd72222f00a54ad9e3
• https://git.kernel.org/stable/c/0676fecbb5242aa22c057e78326d6d6041db034c
• https://git.kernel.org/stable/c/9fa26b9eed6195bf840f39ac183b9a6237548755

No related operational record is retained in the current change model.