This prevents a segfault when an Include file does not exist.

Index: acpica-unix2-20170929/source/compiler/aslfiles.c
===================================================================
--- acpica-unix2-20170929.orig/source/compiler/aslfiles.c
+++ acpica-unix2-20170929/source/compiler/aslfiles.c
@@ -318,7 +318,7 @@ FlOpenIncludeWithPrefix (
     if (!IncludeFile)
     {
         fprintf (stderr, "Could not open include file %s\n", Pathname);
-        ACPI_FREE (Pathname);
+        /* ACPI_FREE (Pathname); <-- forces free() segfault */
         return (NULL);
     }