zip_archive: Improve error message on fallocate failure.

Noticed on b/30765660.

Change-Id: I1a98f83fef02a7368bdc2e1f8f24a0771eebe468
diff --git a/libziparchive/zip_archive.cc b/libziparchive/zip_archive.cc
index a2d6fcc..af6e02c 100644
--- a/libziparchive/zip_archive.cc
+++ b/libziparchive/zip_archive.cc
@@ -819,8 +819,9 @@
       // disk does not have enough space.
       result = TEMP_FAILURE_RETRY(fallocate(fd, 0, current_offset, declared_length));
       if (result == -1 && errno == ENOSPC) {
-        ALOGW("Zip: unable to allocate space for file to %" PRId64 ": %s",
-              static_cast<int64_t>(declared_length + current_offset), strerror(errno));
+        ALOGW("Zip: unable to allocate  %" PRId64 " bytes at offset %" PRId64 " : %s",
+              static_cast<int64_t>(declared_length), static_cast<int64_t>(current_offset),
+              strerror(errno));
         return std::unique_ptr<FileWriter>(nullptr);
       }
     }