ioat3: fix uninitialized var warnings

drivers/dma/ioat/dma_v3.c: In function 'ioat3_prep_memset_lock':
drivers/dma/ioat/dma_v3.c:439: warning: 'fill' may be used uninitialized in this function
drivers/dma/ioat/dma_v3.c:437: warning: 'desc' may be used uninitialized in this function
drivers/dma/ioat/dma_v3.c: In function '__ioat3_prep_xor_lock':
drivers/dma/ioat/dma_v3.c:489: warning: 'xor' may be used uninitialized in this function
drivers/dma/ioat/dma_v3.c:486: warning: 'desc' may be used uninitialized in this function
drivers/dma/ioat/dma_v3.c: In function '__ioat3_prep_pq_lock':
drivers/dma/ioat/dma_v3.c:631: warning: 'pq' may be used uninitialized in this function
drivers/dma/ioat/dma_v3.c:628: warning: 'desc' may be used uninitialized in this function

gcc-4.0, unlike gcc-4.3, does not see that these variables are
initialized before use. Convert the descriptor loops to do-while make
this initialization apparent.

Signed-off-by: Dan Williams <[e-mail]>

drivers/dma/ioat/dma_v3.c

···
 		/* pass */;
 	else
 		return NULL;
-	for (i = 0; i < num_descs; i++) {
+	i = 0;
+	do {
 		size_t xfer_size = min_t(size_t, len, 1 << ioat->xfercap_log);
 
 		desc = ioat2_get_ring_ent(ioat, idx + i);
···
 		len -= xfer_size;
 		dest += xfer_size;
 		dump_desc_dbg(ioat, desc);
-	}
+	} while (++i < num_descs);
 
 	desc->txd.flags = flags;
 	desc->len = total_len;
···
 		/* pass */;
 	else
 		return NULL;
-	for (i = 0; i < num_descs; i += 1 + with_ext) {
+	i = 0;
+	do {
 		struct ioat_raw_descriptor *descs[2];
 		size_t xfer_size = min_t(size_t, len, 1 << ioat->xfercap_log);
 		int s;
···
 		len -= xfer_size;
 		offset += xfer_size;
 		dump_desc_dbg(ioat, desc);
-	}
+	} while ((i += 1 + with_ext) < num_descs);
 
 	/* last xor descriptor carries the unmap parameters and fence bit */
 	desc->txd.flags = flags;
···
 		/* pass */;
 	else
 		return NULL;
-	for (i = 0; i < num_descs; i += 1 + with_ext) {
+	i = 0;
+	do {
 		struct ioat_raw_descriptor *descs[2];
 		size_t xfer_size = min_t(size_t, len, 1 << ioat->xfercap_log);
 
···
 
 		len -= xfer_size;
 		offset += xfer_size;
-	}
+	} while ((i += 1 + with_ext) < num_descs);
 
 	/* last pq descriptor carries the unmap parameters and fence bit */
 	desc->txd.flags = flags;