avformat/utils: Terminate SPS in avci100_1080i_extradata to avoid warnings during parsing

Fixes: AVCI100_Test.mxf
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/utils.c

@@ -4345,7 +4345,7 @@ int ff_generate_avci_extradata(AVStream *st)
         0x11, 0x12, 0x08, 0xc6, 0x8c, 0x04, 0x41, 0x28,
         0x4c, 0x34, 0xf0, 0x1e, 0x01, 0x13, 0xf2, 0xe0,
         0x3c, 0x60, 0x20, 0x20, 0x28, 0x00, 0x00, 0x03,
-        0x00, 0x08, 0x00, 0x00, 0x03, 0x01, 0x94, 0x00,
+        0x00, 0x08, 0x00, 0x00, 0x03, 0x01, 0x94, 0x20,
         // PPS
         0x00, 0x00, 0x00, 0x01, 0x68, 0xce, 0x33, 0x48,
         0xd0