scsi: st: Replace GFP_ATOMIC with GFP_KERNEL in st_probe

st_probe() is never called in atomic context. st_probe() is only set as
".probe" in struct scsi_driver.

Despite never getting called from atomic context, st_probe() calls
kzalloc() with GFP_ATOMIC, which does not sleep for allocation.
GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL, which
can sleep and improve the possibility of sucessful allocation.

This is found by a static analysis tool named DCNS written by myself.
And I also manually check it.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/st.c

@@ -4290,7 +4290,7 @@ static int st_probe(struct device *dev)
 		goto out_buffer_free;
 	}
 
-	tpnt = kzalloc(sizeof(struct scsi_tape), GFP_ATOMIC);
+	tpnt = kzalloc(sizeof(struct scsi_tape), GFP_KERNEL);
 	if (tpnt == NULL) {
 		sdev_printk(KERN_ERR, SDp,
 			    "st: Can't allocate device descriptor.\n");