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
diff --git a/decoder/ihevcd_parse_headers.c b/decoder/ihevcd_parse_headers.c
index 73142f6..47edb1f 100644
--- a/decoder/ihevcd_parse_headers.c
+++ b/decoder/ihevcd_parse_headers.c
@@ -2668,7 +2668,7 @@
             break;
         }
     }
-    if(NULL == ps_sps)
+    if(!ps_sps->i1_sps_valid)
     {
         return;
     }