security/tpm/tpm{1,2}_log_serialized.h: Use C99 flexible arrays

Use C99 flexible arrays instead of older style of one-element or
zero-length arrays.
It allows the compiler to generate errors when the flexible array does
not occur at the end in the structure.

Change-Id: I79e4b34fe682f5f21415cb93cf65394881173b34
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76842
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/security/tpm/tpm1_log_serialized.h

@@ -41,7 +41,7 @@ struct tpm_1_log_table {
 	struct spec_id_event_data spec_id;
 	struct tpm_1_vendor vendor;
 
-	struct tpm_1_log_entry entries[0]; /* Variable number of entries */
+	struct tpm_1_log_entry entries[]; /* Variable number of entries */
 } __packed;
 
 #endif

src/security/tpm/tpm2_log_serialized.h

@@ -64,7 +64,7 @@ struct tpm_2_log_table {
 	struct tpm_digest_sizes digest_sizes[1];
 	uint8_t vendor_info_size;
 	struct tpm_2_vendor vendor;
-	struct tpm_2_log_entry entries[0]; /* Variable number of entries */
+	struct tpm_2_log_entry entries[]; /* Variable number of entries */
 } __packed;
 
 #endif