fixing a "bug" that affected the Postscript hinter: growing a memory block

though "realloc" didn't clear the new bytes of memory..

src/base/ftobjs.c

@@ -109,6 +109,9 @@
     if ( !Q )
       goto Fail;
 
+    if ( size > current )
+      memset( (char*)Q + current, 0, size - current );
+
     *P = Q;
     return FT_Err_Ok;