scsi: lpfc: Fix the NULL vs IS_ERR() bug for debugfs_create_file()

Since debugfs_create_file() returns ERR_PTR and never NULL, use IS_ERR() to
check the return value.

Fixes: 2fcbc569 ("scsi: lpfc: Make debugfs ktime stats generic for NVME and SCSI")
Fixes: 4c47efc1 ("scsi: lpfc: Move SCSI and NVME Stats to hardware queue structures")
Fixes: 6a828b0f ("scsi: lpfc: Support non-uniform allocation of MSIX vectors to hardware queues")
Fixes: 95bfc6d8 ("scsi: lpfc: Make FW logging dynamically configurable")
Fixes: 9f778708 ("scsi: lpfc: Add debugfs support for cm framework buffers")
Fixes: c490850a ("scsi: lpfc: Adapt partitioned XRI lists to efficient sharing")
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Link: https://lore.kernel.org/r/20230906030809.2847970-1-ruanjinjie@huawei.comReviewed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/lpfc/lpfc_debugfs.c

@@ -6073,7 +6073,7 @@ lpfc_debugfs_initialize(struct lpfc_vport *vport)
 					    phba->hba_debugfs_root,
 					    phba,
 					    &lpfc_debugfs_op_multixripools);
-		if (!phba->debug_multixri_pools) {
+		if (IS_ERR(phba->debug_multixri_pools)) {
 			lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
 					 "0527 Cannot create debugfs multixripools\n");
 			goto debug_failed;
@@ -6085,7 +6085,7 @@ lpfc_debugfs_initialize(struct lpfc_vport *vport)
 			debugfs_create_file(name, S_IFREG | 0644,
 					    phba->hba_debugfs_root,
 					    phba, &lpfc_cgn_buffer_op);
-		if (!phba->debug_cgn_buffer) {
+		if (IS_ERR(phba->debug_cgn_buffer)) {
 			lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
 					 "6527 Cannot create debugfs "
 					 "cgn_buffer\n");
@@ -6098,7 +6098,7 @@ lpfc_debugfs_initialize(struct lpfc_vport *vport)
 			debugfs_create_file(name, S_IFREG | 0644,
 					    phba->hba_debugfs_root,
 					    phba, &lpfc_rx_monitor_op);
-		if (!phba->debug_rx_monitor) {
+		if (IS_ERR(phba->debug_rx_monitor)) {
 			lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
 					 "6528 Cannot create debugfs "
 					 "rx_monitor\n");
@@ -6111,7 +6111,7 @@ lpfc_debugfs_initialize(struct lpfc_vport *vport)
 			debugfs_create_file(name, 0644,
 					    phba->hba_debugfs_root,
 					    phba, &lpfc_debugfs_ras_log);
-		if (!phba->debug_ras_log) {
+		if (IS_ERR(phba->debug_ras_log)) {
 			lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
 					 "6148 Cannot create debugfs"
 					 " ras_log\n");
@@ -6132,7 +6132,7 @@ lpfc_debugfs_initialize(struct lpfc_vport *vport)
 			debugfs_create_file(name, S_IFREG | 0644,
 					    phba->hba_debugfs_root,
 					    phba, &lpfc_debugfs_op_lockstat);
-		if (!phba->debug_lockstat) {
+		if (IS_ERR(phba->debug_lockstat)) {
 			lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
 					 "4610 Can't create debugfs lockstat\n");
 			goto debug_failed;
@@ -6358,7 +6358,7 @@ lpfc_debugfs_initialize(struct lpfc_vport *vport)
 		debugfs_create_file(name, 0644,
 				    vport->vport_debugfs_root,
 				    vport, &lpfc_debugfs_op_scsistat);
-	if (!vport->debug_scsistat) {
+	if (IS_ERR(vport->debug_scsistat)) {
 		lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
 				 "4611 Cannot create debugfs scsistat\n");
 		goto debug_failed;
@@ -6369,7 +6369,7 @@ lpfc_debugfs_initialize(struct lpfc_vport *vport)
 		debugfs_create_file(name, 0644,
 				    vport->vport_debugfs_root,
 				    vport, &lpfc_debugfs_op_ioktime);
-	if (!vport->debug_ioktime) {
+	if (IS_ERR(vport->debug_ioktime)) {
 		lpfc_printf_vlog(vport, KERN_ERR, LOG_INIT,
 				 "0815 Cannot create debugfs ioktime\n");
 		goto debug_failed;