cppcheck: (error) Uninitialized variable

As of cppcheck 1.82 warnings are issued when using the list_for_each_*
functions with an uninitialized variable.  Functionally, this is fine
but to resolve the warning initialize these variables.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #9732

module/os/linux/spl/spl-kmem.c

@@ -376,7 +376,7 @@ kmem_del_init(spinlock_t *lock, struct hlist_head *table,
     int bits, const void *addr)
 {
 	struct hlist_head *head;
-	struct hlist_node *node;
+	struct hlist_node *node = NULL;
 	struct kmem_debug *p;
 	unsigned long flags;
 
@@ -573,7 +573,7 @@ static void
 spl_kmem_fini_tracking(struct list_head *list, spinlock_t *lock)
 {
 	unsigned long flags;
-	kmem_debug_t *kd;
+	kmem_debug_t *kd = NULL;
 	char str[17];
 
 	spin_lock_irqsave(lock, flags);