ice: Add check for devm_kzalloc()

Add check for the return value of devm_kzalloc() to guarantee the success
of allocation.

Fixes: 42c2eb6b1f43 ("ice: Implement devlink-rate API")
Signed-off-by: Jiasheng Jiang <[e-mail]>
Reviewed-by: Michal Swiatkowski <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/ethernet/intel/ice/devlink/devlink.c

···
 
 	/* preallocate memory for ice_sched_node */
 	node = devm_kzalloc(ice_hw_to_dev(pi->hw), sizeof(*node), GFP_KERNEL);
+	if (!node)
+		return -ENOMEM;
+
 	*priv = node;
 
 	return 0;