memstick: tifm: remove set but not used variable 'data'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/memstick/host/tifm_ms.c: In function 'tifm_ms_issue_cmd':
drivers/memstick/host/tifm_ms.c:259:17: warning:
 variable 'data' set but not used [-Wunused-but-set-variable]

It's not used any more since commit 92b22d93 ("tifm: fix the
MemoryStick host fifo handling code")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/memstick/host/tifm_ms.c

@@ -254,7 +254,6 @@ static unsigned int tifm_ms_transfer_data(struct tifm_ms *host)
 static int tifm_ms_issue_cmd(struct tifm_ms *host)
 {
 	struct tifm_dev *sock = host->dev;
-	unsigned char *data;
 	unsigned int data_len, cmd, sys_param;
 
 	host->cmd_flags = 0;
@@ -263,8 +262,6 @@ static int tifm_ms_issue_cmd(struct tifm_ms *host)
 	host->io_word = 0;
 	host->cmd_flags = 0;
 
-	data = host->req->data;
-
 	host->use_dma = !no_dma;
 
 	if (host->req->long_data) {