[SCSI] dc395x: fix uninitialized var warning

drivers/scsi/dc395x.c: In function 'dc395x_init_one':
drivers/scsi/dc395x.c:4270: warning: 'ptr' may be used uninitialized in this function
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/dc395x.c

@@ -4267,7 +4267,7 @@ static int __devinit adapter_sg_tables_alloc(struct AdapterCtlBlk *acb)
 	const unsigned srbs_per_page = PAGE_SIZE/SEGMENTX_LEN;
 	int srb_idx = 0;
 	unsigned i = 0;
-	struct SGentry *ptr;
+	struct SGentry *uninitialized_var(ptr);
 
 	for (i = 0; i < DC395x_MAX_SRB_CNT; i++)
 		acb->srb_array[i].segment_x = NULL;