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* src/truetype/ttinterp.c (Ins_MD): Avoid `FT_ABS`.

Reported as

  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=38562

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

--- a/src/truetype/ttinterp.c

+++ b/src/truetype/ttinterp.c

@@ -5003,9 +5003,9 @@

 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY

     /* Disable Type 2 Vacuform Rounds - e.g. Arial Narrow */

-    if ( SUBPIXEL_HINTING_INFINALITY &&

-         exc->ignore_x_mode          &&

-         FT_ABS( D ) == 64           )

+    if ( SUBPIXEL_HINTING_INFINALITY         &&

+         exc->ignore_x_mode                  &&

+         ( D < 0 ? NEG_LONG( D ) : D ) == 64 )

       D += 1;

 #endif /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY */