[SCSI] iscsi_boot_sysfs: Fix a memory leak in iscsi_boot_destroy_kset()

Load and unload iscsi_ibft module will cause kernel memory leak, fix it
in scsi/iscsi_boot_sysfs.c iscsi_boot_destroy_kset().
Signed-off-by: NEthan Zhao <ethan.kernel@gmail.com>
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

drivers/scsi/iscsi_boot_sysfs.c

@@ -490,5 +490,6 @@ void iscsi_boot_destroy_kset(struct iscsi_boot_kset *boot_kset)
 		iscsi_boot_remove_kobj(boot_kobj);
 
 	kset_unregister(boot_kset->kset);
+	kfree(boot_kset);
 }
 EXPORT_SYMBOL_GPL(iscsi_boot_destroy_kset);