changes to f_code calculation for b frames -> changed checksum

Originally committed as revision 1552 to svn://svn.ffmpeg.org/ffmpeg/trunk

tests/ffmpeg.regression.ref

@@ -13,8 +13,8 @@ cb08566744117b65a2c50758ec33b535 *./data/out.yuv
 76dea7e8f5a4c7e77b80ce1ff4f632b5 *./data/out.yuv
 cbb3e7118b48671c686d046e7c1ae4b0 *./data/a-odivx.avi
 98bb113f0fa0d61fd3b0b1699ac6c69a *./data/out.yuv
-6138b27169529327d3674bdcd012ec52 *./data/a-mpeg4-rc.avi
-5d0fd64a61f9044aaaf7fc76b062c9db *./data/out.yuv
+301a256487aa79ad4b683bda07a99ab9 *./data/a-mpeg4-rc.avi
+580000bfe2d4359d9aa9a9415f953b3b *./data/out.yuv
 7e040fda2b7696fea348a21b54eec1be *./data/a-mpeg4-adv.avi
 4c5e8754506ff2c53649541e4fcd2438 *./data/out.yuv
 5bcc6fd4b7dde27c74c633c761f0e5b1 *./data/a-mjpeg.avi