[patch] [SCSI] aic94xx: silence a static checker warning

[Dan Carpenter]

"ddb" is a number between 0-64.  It can't ever be >= 0xFFFF.  But the
static checker complains that since we're capping the upper bound, we
may as well cap the lower bound and disallow negatives as well.

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

diff --git a/drivers/scsi/aic94xx/aic94xx_dev.c b/drivers/scsi/aic94xx/aic94xx_dev.c
index 3307238..84eba3e 100644
--- a/drivers/scsi/aic94xx/aic94xx_dev.c
+++ b/drivers/scsi/aic94xx/aic94xx_dev.c
@@ -73,7 +73,7 @@ out:
 
 static void asd_free_ddb(struct asd_ha_struct *asd_ha, int ddb)
 {
-	if (!ddb || ddb >= 0xFFFF)
+	if (ddb <= 0 || ddb >= 0xFFFF)
 		return;
 	asd_ddbsite_write_byte(asd_ha, ddb, DDB_TYPE, DDB_TYPE_UNUSED);
 	CLEAR_DDB(ddb, asd_ha);