sgienc: Do not end RLE lines with 0s

This is never mentioned in the specifications, and decoders work
just as fine without it. Update the fate references since the compressed
file is smaller.

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

libavcodec/sgienc.c

@@ -171,8 +171,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
                 }
 
                 buf += length;
-                bytestream_put_byte(&buf, 0);
-                bytestream_put_be32(&lengthtab, length + 1);
+                bytestream_put_be32(&lengthtab, length);
                 in_buf -= p->linesize[0];
             }
         }

tests/ref/lavf/sgi

@@ -1,3 +1,3 @@
-7054acafd275e51cec28d4518e213081 *./tests/data/images/sgi/02.sgi
+d446e540a7c18da5fd3cc0e9942cd46f *./tests/data/images/sgi/02.sgi
 ./tests/data/images/sgi/%02d.sgi CRC=0x28c7369b
-308151 ./tests/data/images/sgi/02.sgi
+307287 ./tests/data/images/sgi/02.sgi

tests/ref/seek/lavf-sgi

@@ -1,4 +1,4 @@
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:     -1 size:308336
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:     -1 size:307472
 ret:-EINVAL    st:-1 flags:0  ts:-1.000000
 ret:-EINVAL    st:-1 flags:1  ts: 1.894167
 ret:-EINVAL    st: 0 flags:0  ts: 0.800000