test/io/console/test_io_console.rb: parens needed

Author: mame

test/io/console/test_io_console.rb

@@ -390,7 +390,7 @@ def test_intr
       # TestIO_Console#test_intr [/usr/home/chkbuild/chkbuild/tmp/build/20220304T163001Z/ruby/test/io/console/test_io_console.rb:387]:
       # <"25"> expected but was
       # <"-e:12:in `p': \e[1mexecution expired (\e[1;4mTimeout::Error\e[m\e[1m)\e[m">.
-      if cc = ctrl["dsusp"] && /freebsd/ !~ RUBY_PLATFORM
+      if (cc = ctrl["dsusp"]) && /freebsd/ !~ RUBY_PLATFORM
         assert_ctrl("#{cc.ord}", cc, r, w)
         assert_ctrl("#{cc.ord}", cc, r, w)
         assert_ctrl("#{cc.ord}", cc, r, w)