fbdev: omapfb: Fix typo in comment

Reported-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Kreimer <algonell@gmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>

drivers/video/fbdev/omap2/omapfb/dss/hdmi.h

@@ -351,7 +351,7 @@ struct omap_hdmi {
 	bool audio_configured;
 	struct omap_dss_audio audio_config;
 
-	/* This lock should be taken when booleans bellow are touched. */
+	/* This lock should be taken when booleans below are touched. */
 	spinlock_t audio_playing_lock;
 	bool audio_playing;
 	bool display_enabled;