bitbake: bitbake-diffigs: Don't pull in tinfoil unless we really need/plan to use it

This means we can run in parallel with other bitbake processed we're not in
task mode.

(Bitbake rev: 20222f2f16130e91eed5e68286188ee0e8f8f3bf)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/bin/bitbake-diffsigs

@@ -85,8 +85,8 @@ options, args = parser.parse_args(sys.argv)
 if len(args) == 1:
     parser.print_help()
 else:
-    tinfoil = bb.tinfoil.Tinfoil()
     if options.taskmode:
+        tinfoil = bb.tinfoil.Tinfoil()
         if len(args) < 3:
             logger.error("Please specify a recipe and task name")
             sys.exit(1)