interconnect: fix mem leak when freeing nodes

The node link array is allocated when adding links to a node but is not
deallocated when nodes are destroyed.

Fixes: 11f1ceca7031 ("interconnect: Add generic on-chip interconnect API")
Cc: stable@vger.kernel.org      # 5.1
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Tested-by: Luca Ceresoli <luca.ceresoli@bootlin.com> # i.MX8MP MSC SM2-MB-EP1 Board
Link: https://lore.kernel.org/r/20230306075651.2449-2-johan+linaro@kernel.org
Signed-off-by: Georgi Djakov <djakov@kernel.org>

drivers/interconnect/core.c

@@ -850,6 +850,10 @@ void icc_node_destroy(int id)
 
 	mutex_unlock(&icc_lock);
 
+	if (!node)
+		return;
+
+	kfree(node->links);
 	kfree(node);
 }
 EXPORT_SYMBOL_GPL(icc_node_destroy);