The return value of SPI_connect

Hi

I found the function SPI_connect() has only one return value(SPI_OK_CONNECT).
But I also found that some places check the return value of SPI_connect() like the following:

    if (SPI_connect() != SPI_OK_CONNECT)
        elog(ERROR, "SPI_connect failed");

Is it necessary to check the return value of SPI_connect() ?

And in doc https://www.postgresql.org/docs/13/spi-spi-connect.html
It also says SPI_connect() can return SPI_ERROR_CONNECT on error.

May be we can make "int SPI_connect()" => "void SPI_connect()" and fix the doc ?

Best regards,
houzj