[PATCH] SCSI atp870u.c: make a needlessly global function

The patch below makes the function is870 which has no external users
static.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/atp870u.c

@@ -1085,7 +1085,7 @@ static void tscam(struct Scsi_Host *host)
 
 }
 
-void is870(struct Scsi_Host *host, unsigned int wkport)
+static void is870(struct Scsi_Host *host, unsigned int wkport)
 {
 	unsigned int tmport;
 	unsigned char i, j, k, rmb, n;