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* src/base/ftobjs.c (ft_open_face_internal): Properly guard `face_index`.

We must ensure that the cast to `FT_Int` doesn't change the sign.

Fixes #1139.

git/fs: mount .git/fs: mount/attach disallowed

--- a/src/base/ftobjs.c

+++ b/src/base/ftobjs.c

@@ -2527,6 +2527,15 @@

 #endif

+    /* only use lower 31 bits together with sign bit */

+    if ( face_index > 0 )

+      face_index &= 0x7FFFFFFFL;

+    else

+    {

+      face_index &= 0x7FFFFFFFL;

+      face_index  = -face_index;

+    }

+

 #ifdef FT_DEBUG_LEVEL_TRACE

     FT_TRACE3(( "FT_Open_Face: " ));

     if ( face_index < 0 )