[truetype] Partly revert 5b626281.

Fixes #1118.

* src/truetype/ttpload.c (tt_face_load_hdmx): Do not assume that
`record_size` is rounded even though the records are padded.
diff --git a/src/truetype/ttpload.c b/src/truetype/ttpload.c
index 1368e17..55a2238 100644
--- a/src/truetype/ttpload.c
+++ b/src/truetype/ttpload.c
@@ -565,7 +565,7 @@
     if ( num_records > 255               ||
          ( num_records > 0             &&
            ( record_size > 0x10004UL ||
-             record_size & 3         ) ) )
+             record_size < 4         ) ) )
     {
       error = FT_THROW( Invalid_File_Format );
       goto Fail;