Completion of error handling

[elfring]

Would you like to add more error handling for return values from functions like the following?

• fopen ⇒ UnitBuf<T>::writeToFile
• malloc ⇒ vvdec_params_alloc

[elfring]

👀 Further update candidates were left over.

Example:

vvdec/source/Lib/CommonLib/Buffer.cpp

Lines 873 to 888 in d5a7998

	template<typename T>
	void UnitBuf<T>::writeToFile( std::string filename ) const
	{
	FILE* f = fopen( filename.c_str(), "w" );
	CHECK( f == nullptr, "writeToFile() cannot open file for writing" )
	for( auto& b: bufs )
	{
	for( unsigned y = 0; y < b.height; y++ )
	{
	fwrite( b.bufAt( 0, y ), sizeof( T ), b.width, f );
	}
	}
	fclose( f );
	}

💭 I suggest to avoid ignorance of return values a bit more.
Would you like to detect every error situation as early as possible?