mmc: mvsdio: Fix dma_unmap_sg() nents value

The dma_unmap_sg() functions should be called with the same nents as the
dma_map_sg(), not the value the map function returned.

Fixes: 236caa7cc351 ("mmc: SDIO driver for Marvell SoCs")
Signed-off-by: Thomas Fourier <[e-mail]>
Reviewed-by: Linus Walleij <[e-mail]>
Cc: [e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/host/mvsdio.c

···
 		host->pio_ptr = NULL;
 		host->pio_size = 0;
 	} else {
-		dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_frags,
+		dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
 			     mmc_get_dma_dir(data));
 	}