spi: Kill superfluous cast in spi_w8r16()

spi_write_then_read() takes a "void *" for rxbuf, so there's no need to
cast the buffer pointer to "u8 *".

Signed-off-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 77b529e..21a7251d 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -847,7 +847,7 @@
 	ssize_t			status;
 	u16			result;
 
-	status = spi_write_then_read(spi, &cmd, 1, (u8 *) &result, 2);
+	status = spi_write_then_read(spi, &cmd, 1, &result, 2);
 
 	/* return negative errno or unsigned value */
 	return (status < 0) ? status : result;