journal-verify: fix offset reported for tail hash mismatch

After walking a hash chain, the loop exits with p == 0. The error()
call for a tail_hash_offset mismatch passed p as the file offset,
printing 0000000000000000 instead of the actual last data object.

Pass 'last' instead, which holds the offset of the final chain entry.

Signed-off-by: dongshengyuan <dongshengyuan@uniontech.com>

src/libsystemd/sd-journal/journal-verify.c

@@ -590,7 +590,7 @@ static int verify_data_hash_table(
                 }
 
                 if (last != le64toh(f->data_hash_table[i].tail_hash_offset)) {
-                        error(p,
+                        error(last,
                               "Tail hash pointer mismatch in hash table (%"PRIu64" != %"PRIu64")",
                               last,
                               le64toh(f->data_hash_table[i].tail_hash_offset));