staging: ks7010: change local variable type in ks7010_rw_function

Local variable 'byte' in ks7010_rw_function is declared as unsigned
char and can be declared as u8 which is preferred. It is being used
in ks7010_sdio_readb which is already expecting an u8.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/ks7010/ks7010_sdio.c

@@ -477,7 +477,7 @@ static void ks7010_rw_function(struct work_struct *work)
 						    struct ks_wlan_private,
 						    rw_dwork.work);
 	struct sdio_func *func = ks7010_to_func(priv);
-	unsigned char byte;
+	u8 byte;
 	int ret;
 
 	/* wait after DOZE */