avcodec/jpeg2000dec: remove ST=3 case

Fixes: CID1460979 Logically dead code

Sponsored-by: Sovereign Tech Fund
Reviewed-by: Tomas Härdin <git@haerdin.se>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 4ed4f9a6c0)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/jpeg2000dec.c

@@ -834,9 +834,6 @@ static int get_tlm(Jpeg2000DecoderContext *s, int n)
         case 2:
             bytestream2_get_be16(&s->g);
             break;
-        case 3:
-            bytestream2_get_be32(&s->g);
-            break;
         }
         if (SP == 0) {
             bytestream2_get_be16(&s->g);