scsi: qla2xxx: Initialize 'n' before using it

The following code:

	qla82xx_rom_fast_read(ha, 0, &n)

only initializes 'n' if it succeeds. Since 'n' may be reported in a debug
message even if no ROM reads succeeded, initialize 'n' to zero.

This patch fixes the following sparse warning:

qla_nx.c:1218: qla82xx_pinit_from_rom() error: uninitialized symbol 'n'.

Link: https://lore.kernel.org/r/20200629225454.22863-5-bvanassche@acm.org
Cc: Nilesh Javali <njavali@marvell.com>
Cc: Quinn Tran <qutran@marvell.com>
Cc: Himanshu Madhani <himanshu.madhani@oracle.com>
Cc: Martin Wilck <mwilck@suse.com>
Cc: Roman Bolshakov <r.bolshakov@yadro.com>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Reviewed-by: Shyam Sundar <ssundar@marvell.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_nx.c

@@ -1167,6 +1167,7 @@ qla82xx_pinit_from_rom(scsi_qla_host_t *vha)
 	 * Offset 4: Offset and number of addr/value pairs
 	 * that present in CRB initialize sequence
 	 */
+	n = 0;
 	if (qla82xx_rom_fast_read(ha, 0, &n) != 0 || n != 0xcafecafeUL ||
 	    qla82xx_rom_fast_read(ha, 4, &n) != 0) {
 		ql_log(ql_log_fatal, vha, 0x006e,