decoder: Fix valid SPS check in parsing SEI

When parsing SEI, ensure there is at least one valid SPS.

Test: poc in bug
Bug: 134420911

Change-Id: If3aa142b7fac324f8416e647572dfb002f56e06d
(cherry picked from commit 61646846b3c26789d0cc5d2a18b58ed8e94cd58a)
1 file changed