s390/pci: Fix missing check for zpci_create_device() error return

JIRA: https://issues.redhat.com/browse/RHEL-94944

commit 42420c5
Author: Niklas Schnelle <schnelle@linux.ibm.com>
Date:   Wed Apr 30 15:26:18 2025 +0200

    s390/pci: Fix missing check for zpci_create_device() error return

    The zpci_create_device() function returns an error pointer that needs to
    be checked before dereferencing it as a struct zpci_dev pointer. Add the
    missing check in __clp_add() where it was missed when adding the
    scan_list in the fixed commit. Simply not adding the device to the scan
    list results in the previous behavior.

    Cc: stable@vger.kernel.org
    Fixes: 0467cdd ("s390/pci: Sort PCI functions prior to creating virtual busses")
    Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
    Reviewed-by: Gerd Bayer <gbayer@linux.ibm.com>
    Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

Signed-off-by: Mete Durlu <mdurlu@redhat.com>

Author: Mete Durlu

arch/s390/pci/pci_clp.c

@@ -427,6 +427,8 @@ static void __clp_add(struct clp_fh_list_entry *entry, void *data)
 		return;
 	}
 	zdev = zpci_create_device(entry->fid, entry->fh, entry->config_state);
+	if (IS_ERR(zdev))
+		return;
 	list_add_tail(&zdev->entry, scan_list);
 }