Correct test for linux 2.2 joystick API, which returned true in every
case.

diff --git a/configure.in b/configure.in
index 020151b..3c08add 100644
--- a/configure.in
+++ b/configure.in
@@ -738,7 +738,7 @@
 	wine_cv_linux_joystick_22_api=no
 	)
    )
-   if test "$wine_cv_linux_joystick_22_api"
+   if test "$wine_cv_linux_joystick_22_api" = "yes"
    then
       AC_DEFINE(HAVE_LINUX_22_JOYSTICK_API)
    fi