[PATCH] efi_loader: Remove incorrect calls of EFI_CALL in TCG2

[Ilias Apalodimas]

There is two unneeded EFI_CALL references in tcg2_measure_pe_image().
The first one in efi_search_protocol() and the second on in the device path
calculation.  The second isn't even a function we should be calling, but a
pointer assignment, which happens to work with the existing macro.

While at it switch the malloc call to a calloc, remove the unnecessary cast
and get rid of an unneeded if statement before copying the device path

Signed-off-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
---
 lib/efi_loader/efi_tcg2.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c
index 1319a8b37868..d026af2b2350 100644
--- a/lib/efi_loader/efi_tcg2.c
+++ b/lib/efi_loader/efi_tcg2.c
@@ -839,20 +839,19 @@ efi_status_t tcg2_measure_pe_image(void *efi, u64 efi_size,
 	if (ret != EFI_SUCCESS)
 		return ret;
 
-	ret = EFI_CALL(efi_search_protocol(&handle->header,
-					   &efi_guid_loaded_image_device_path,
-					   &handler));
+	ret = efi_search_protocol(&handle->header,
+				  &efi_guid_loaded_image_device_path, &handler);
 	if (ret != EFI_SUCCESS)
 		return ret;
 
-	device_path = EFI_CALL(handler->protocol_interface);
+	device_path = handler->protocol_interface;
 	device_path_length = efi_dp_size(device_path);
 	if (device_path_length > 0) {
 		/* add end node size */
 		device_path_length += sizeof(struct efi_device_path);
 	}
 	event_size = sizeof(struct uefi_image_load_event) + device_path_length;
-	image_load_event = (struct uefi_image_load_event *)malloc(event_size);
+	image_load_event = calloc(1, event_size);
 	if (!image_load_event)
 		return EFI_OUT_OF_RESOURCES;
 
@@ -875,10 +874,8 @@ efi_status_t tcg2_measure_pe_image(void *efi, u64 efi_size,
 		goto out;
 	}
 
-	if (device_path_length > 0) {
-		memcpy(image_load_event->device_path, device_path,
-		       device_path_length);
-	}
+	/* device_path_length might be zero */
+	memcpy(image_load_event->device_path, device_path, device_path_length);
 
 	ret = tcg2_agile_log_append(pcr_index, event_type, &digest_list,
 				    event_size, (u8 *)image_load_event);
-- 
2.33.0