[PULL 02/33] QIOChannelSocket: Introduce assert and reduce ifdefs to improve readability

From: Leonardo Bras During implementation of MSG_ZEROCOPY feature, a lot of #ifdefs were introduced, particularly at qio_channel_socket_writev(). Rewrite some of those changes so it's easier to read. Also, introduce an assert to help detect incorrect zero-copy usage is when it's disabled on bui

[PULL 02/33] QIOChannelSocket: Introduce assert and reduce ifdefs to improve readability

From: Leonardo Bras During implementation of MSG_ZEROCOPY feature, a lot of #ifdefs were introduced, particularly at qio_channel_socket_writev(). Rewrite some of those changes so it's easier to read. Also, introduce an assert to help detect incorrect zero-copy usage is when it's disabled on bui