scsi: qedi: make qedi_ll2_buf_size static

Fix the following sparse warning:

drivers/scsi/qedi/qedi_main.c:44:6: warning: symbol 'qedi_ll2_buf_size' was
not declared. Should it be static?

Link: https://lore.kernel.org/r/20200415085029.7170-1-yanaijie@huawei.comReported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qedi/qedi_main.c

@@ -45,7 +45,7 @@ module_param(qedi_io_tracing, uint, 0644);
 MODULE_PARM_DESC(qedi_io_tracing,
 		 " Enable logging of SCSI requests/completions into trace buffer. (default off).");
 
-uint qedi_ll2_buf_size = 0x400;
+static uint qedi_ll2_buf_size = 0x400;
 module_param(qedi_ll2_buf_size, uint, 0644);
 MODULE_PARM_DESC(qedi_ll2_buf_size,
 		 "parameter to set ping packet size, default - 0x400, Jumbo packets - 0x2400.");