scsi: lpfc: Terminate string in lpfc_debugfs_nvmeio_trc_write()

jira VULN-70476
cve-pre CVE-2022-50030
commit-author Dan Carpenter <dan.carpenter@oracle.com>
commit 9020be1

The "mybuf" string comes from the user, so we need to ensure that it is NUL
terminated.

Link: https://lore.kernel.org/r/20211214070527.GA27934@kili
Fixes: bd2cdd5 ("scsi: lpfc: NVME Initiator: Add debugfs support")
	Reviewed-by: James Smart <jsmart2021@gmail.com>
	Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
	Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
(cherry picked from commit 9020be1)
	Signed-off-by: Roxana Nicolescu <rnicolescu@ciq.com>

Author: roxanan1996

drivers/scsi/lpfc/lpfc_debugfs.c

@@ -2954,8 +2954,8 @@ lpfc_debugfs_nvmeio_trc_write(struct file *file, const char __user *buf,
 	char mybuf[64];
 	char *pbuf;
 
-	if (nbytes > 64)
-		nbytes = 64;
+	if (nbytes > 63)
+		nbytes = 63;
 
 	memset(mybuf, 0, sizeof(mybuf));