mac_dbdma: remove unused IO fields from DBDMAState

These fields were used to manually handle IO requests that weren't aligned
to a sector boundary before this feature was supported by the block API.

Once the block API changed to support byte-aligned IO requests, the macio
controller was switched over to use it in commit be1e3439 but these fields
were accidentally left behind. Remove them, including the initialisation
in DBDMA_init().

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

hw/misc/macio/mac_dbdma.c

@@ -893,9 +893,7 @@ void* DBDMA_init (MemoryRegion **dbdma_mem)
     s = g_malloc0(sizeof(DBDMAState));
 
     for (i = 0; i < DBDMA_CHANNELS; i++) {
-        DBDMA_io *io = &s->channels[i].io;
         DBDMA_channel *ch = &s->channels[i];
-        qemu_iovec_init(&io->iov, 1);
 
         ch->rw = dbdma_unassigned_rw;
         ch->flush = dbdma_unassigned_flush;

include/hw/ppc/mac_dbdma.h

@@ -42,10 +42,6 @@ struct DBDMA_io {
     DBDMA_end dma_end;
     /* DMA is in progress, don't start another one */
     bool processing;
-    /* unaligned last sector of a request */
-    uint8_t head_remainder[0x200];
-    uint8_t tail_remainder[0x200];
-    QEMUIOVector iov;
     /* DMA request */
     void *dma_mem;
     dma_addr_t dma_len;