scsi: pcmcia: nsp_cs: Remove unused variable 'dummy'

There is no need to populate an unused variable, even if the read is
required.

Fixes the following W=1 kernel build warning(s):

 drivers/scsi/pcmcia/nsp_cs.c: In function ‘nsp_cs_message’:
 drivers/scsi/pcmcia/nsp_cs.c:143:2: warning: function ‘nsp_cs_message’ might be a candidate for ‘gnu_printf’ format attribute [-Wsuggest-attribute=format]
 drivers/scsi/pcmcia/nsp_cs.c: In function ‘nsp_fifo_count’:
 drivers/scsi/pcmcia/nsp_cs.c:692:24: warning: variable ‘dummy’ set but not used [-Wunused-but-set-variable]

Link: https://lore.kernel.org/r/20200707140055.2956235-9-lee.jones@linaro.org
Cc: YOKOTA Hiroshi <yokota@netlab.is.tsukuba.ac.jp>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/pcmcia/nsp_cs.c

@@ -690,14 +690,14 @@ static int nsp_fifo_count(struct scsi_cmnd *SCpnt)
 {
 	unsigned int base = SCpnt->device->host->io_port;
 	unsigned int count;
-	unsigned int l, m, h, dummy;
+	unsigned int l, m, h;
 
 	nsp_index_write(base, POINTERCLR, POINTER_CLEAR | ACK_COUNTER);
 
 	l     = nsp_index_read(base, TRANSFERCOUNT);
 	m     = nsp_index_read(base, TRANSFERCOUNT);
 	h     = nsp_index_read(base, TRANSFERCOUNT);
-	dummy = nsp_index_read(base, TRANSFERCOUNT); /* required this! */
+	nsp_index_read(base, TRANSFERCOUNT); /* required this! */
 
 	count = (h << 16) | (m << 8) | (l << 0);