Rename vdi_port_read_buf_get() to match convention
Rename vdi_port_read_buf_get() to match convention

Since this is technically a RedsState method, name it as such.

Acked-by: Frediano Ziglio <55d48b080b2e443e395cde84d2c83b135a4ff48e@redhat.com>

SPICE/spice,fgouget/spice,fgouget/spice,fgouget/spice,SPICE/spice,fgouget/spice,SPICE/spice