dpaa2-switch: Fix memory leak in dpaa2_switch_acl_entry_add() and dpaa2_switch_acl_entry_remove()

The cmd_buff needs to be freed when error happened in
dpaa2_switch_acl_entry_add() and dpaa2_switch_acl_entry_remove().

Fixes: 1110318 ("dpaa2-switch: add tc flower hardware offload on ingress traffic")
Signed-off-by: Yuan Can <yuancan@huawei.com>
Link: https://lore.kernel.org/r/20221205061515.115012-1-yuancan@huawei.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Author: Yuan Can

drivers/net/ethernet/freescale/dpaa2/dpaa2-switch-flower.c

@@ -132,6 +132,7 @@ int dpaa2_switch_acl_entry_add(struct dpaa2_switch_filter_block *filter_block,
 						 DMA_TO_DEVICE);
 	if (unlikely(dma_mapping_error(dev, acl_entry_cfg->key_iova))) {
 		dev_err(dev, "DMA mapping failed\n");
+		kfree(cmd_buff);
 		return -EFAULT;
 	}
 
@@ -142,6 +143,7 @@ int dpaa2_switch_acl_entry_add(struct dpaa2_switch_filter_block *filter_block,
 			 DMA_TO_DEVICE);
 	if (err) {
 		dev_err(dev, "dpsw_acl_add_entry() failed %d\n", err);
+		kfree(cmd_buff);
 		return err;
 	}
 
@@ -172,6 +174,7 @@ dpaa2_switch_acl_entry_remove(struct dpaa2_switch_filter_block *block,
 						 DMA_TO_DEVICE);
 	if (unlikely(dma_mapping_error(dev, acl_entry_cfg->key_iova))) {
 		dev_err(dev, "DMA mapping failed\n");
+		kfree(cmd_buff);
 		return -EFAULT;
 	}
 
@@ -182,6 +185,7 @@ dpaa2_switch_acl_entry_remove(struct dpaa2_switch_filter_block *block,
 			 DMA_TO_DEVICE);
 	if (err) {
 		dev_err(dev, "dpsw_acl_remove_entry() failed %d\n", err);
+		kfree(cmd_buff);
 		return err;
 	}