libfdisk: (gpt) add comment

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/libfdisk/src/gpt.c b/libfdisk/src/gpt.c
index c6f482fd861c83c6e15beb8ba1168aae2cddb387..c132739b2bfa43a9aec1e1d888b5e8d9efcd4b1a 100644 (file)
--- a/libfdisk/src/gpt.c
+++ b/libfdisk/src/gpt.c
@@ -2122,13 +2122,14 @@ static int gpt_write_pmbr(struct fdisk_context *cxt)
                pmbr->partition_record[0].size_in_lba =
                        cpu_to_le32((uint32_t) (cxt->total_sectors - 1ULL));
 
+       /* Read the current PMBR and compare it with the new, don't write if
+        * the same. */
        current = malloc(sizeof(*current));
        if (!current)
                goto do_write;
 
        rc = gpt_read(cxt, GPT_PMBR_LBA * cxt->sector_size,
                      current, cxt->sector_size);
-
        if (!rc)
                rc = memcmp(pmbr, current, sizeof(*current));