drm/i915: Introduce enableddisabled helper

Similar to existing yesno and onoff and use it throughout the code.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1479385814-2358-2-git-send-email-tvrtko.ursulin@linux.intel.com
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 1cc971c..96407f6 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1762,8 +1762,7 @@ static int i915_sr_status(struct seq_file *m, void *unused)
 	intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
 	intel_runtime_pm_put(dev_priv);
 
-	seq_printf(m, "self-refresh: %s\n",
-		   sr_enabled ? "enabled" : "disabled");
+	seq_printf(m, "self-refresh: %s\n", enableddisabled(sr_enabled));
 
 	return 0;
 }