scsi: ufs: Fix unsigned int compared with less than zero

Variable 'tag' is currently an unsigned int and is being compared to less
than zero, this check is always false. Fix this by making 'tag' an int.

Link: https://lore.kernel.org/r/[e-mail]
Fixes: 4728ab4a8e64 ("scsi: ufs: Remove ufshcd_valid_tag()")
Reviewed-by: Bart Van Assche <[e-mail]>
Signed-off-by: Colin Ian King <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>
Addresses-Coverity: ("Macro compares unsigned to 0")

drivers/scsi/ufs/ufshcd.c

···
 {
 	struct Scsi_Host *host = cmd->device->host;
 	struct ufs_hba *hba = shost_priv(host);
-	unsigned int tag = cmd->request->tag;
+	int tag = cmd->request->tag;
 	struct ufshcd_lrb *lrbp = &hba->lrb[tag];
 	unsigned long flags;
 	int err = FAILED;