sdhci: disable DMA for req, not completely

The wrong flag was manipulated when an invalid sg list was given, turning
off DMA on the next (and all subsequent) request instead of the current
one.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

drivers/mmc/host/sdhci.c

@@ -654,7 +654,7 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
 				 * us an invalid request.
 				 */
 				WARN_ON(1);
-				host->flags &= ~SDHCI_USE_DMA;
+				host->flags &= ~SDHCI_REQ_USE_DMA;
 			} else {
 				writel(host->adma_addr,
 					host->ioaddr + SDHCI_ADMA_ADDRESS);
@@ -673,7 +673,7 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
 				 * us an invalid request.
 				 */
 				WARN_ON(1);
-				host->flags &= ~SDHCI_USE_DMA;
+				host->flags &= ~SDHCI_REQ_USE_DMA;
 			} else {
 				WARN_ON(sg_cnt != 1);
 				writel(sg_dma_address(data->sg),