[ffmpeg] Avoid empty type array which cause a msvc ICE

[xiaozhuai]

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libavformat/cbs.c includes this file with a different set of CBS_* macros. In configurations using --disable-everything, all coded bitstream types may be disabled for that instance, leaving cbs_type_table empty.

This triggers a zero-sized array warning with MSVC and may lead to an internal compiler error with optimization enabled.

Add a NULL terminator and iterate until the terminator instead of using FF_ARRAY_ELEMS(). The runtime behavior is unchanged.

The code currently permits building an instance of cbs.c with no enabled coded bitstream types. In that case the generated table is empty. Make the table explicitly NULL-terminated so this configuration is valid C for compilers that reject or mishandle empty arrays.

[xiaozhuai]

I've send the patch to the upstream. Please do not merge this PR until it has been reviewed by the upstream.
A link to track the status of the upstream PR will be added once it becomes available.