scsi: gdth: Make __gdth_execute static

Fix sparse warning:

drivers/scsi/gdth.c:332:5: warning:
 symbol '__gdth_execute' was not declared. Should it be static?

Link: https://lore.kernel.org/r/1586276474-34480-1-git-send-email-wanghai38@huawei.comReported-by: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NWang Hai <wanghai38@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/gdth.c

@@ -329,8 +329,8 @@ static void gdth_scsi_done(struct scsi_cmnd *scp)
 		scp->scsi_done(scp);
 }
 
-int __gdth_execute(struct scsi_device *sdev, gdth_cmd_str *gdtcmd, char *cmnd,
-                   int timeout, u32 *info)
+static int __gdth_execute(struct scsi_device *sdev, gdth_cmd_str *gdtcmd,
+			  char *cmnd, int timeout, u32 *info)
 {
     gdth_ha_str *ha = shost_priv(sdev->host);
     struct scsi_cmnd *scp;