cmd: gpt: fix the wrong size parse for the last partition

The calculation of "dev_desc->lba - 34  - 1 - offset" is not correct for
size '-', because both fist_usable_lba and last_usable_lba will remain
34 sectors.

We can simply use 0 for size '-' because the part_efi module will decode
the size and auto extend the size to maximum available size.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>

cmd/gpt.c

@@ -298,8 +298,8 @@ static int set_gpt_info(struct blk_desc *dev_desc,
 		if (extract_env(val, &p))
 			p = val;
 		if ((strcmp(p, "-") == 0)) {
-			/* remove first usable lba and last block */
-			parts[i].size = dev_desc->lba - 34  - 1 - offset;
+			/* Let part efi module to auto extend the size */
+			parts[i].size = 0;
 		} else {
 			size_ll = ustrtoull(p, &p, 0);
 			parts[i].size = lldiv(size_ll, dev_desc->blksz);

disk/part_efi.c

@@ -655,6 +655,10 @@ int gpt_verify_partitions(struct blk_desc *dev_desc,
 		      (unsigned long long)partitions[i].size);
 
 		if (le64_to_cpu(gpt_part_size) != partitions[i].size) {
+			/* We do not check the extend partition size */
+			if ((i == parts - 1) && (partitions[i].size == 0))
+				continue;
+
 			error("Partition %s size: %llu does not match %llu!\n",
 			      efi_str, (unsigned long long)gpt_part_size,
 			      (unsigned long long)partitions[i].size);