sound: Kconfig typo fix

Fix a typo in the help text in sound/Kconfig.
Signed-off-by: Timothy Knoll <knollbert@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/Kconfig

@@ -58,7 +58,7 @@ config SOUND_OSS_CORE_PRECLAIM
 	  Please read Documentation/feature-removal-schedule.txt for
 	  details.
 
-	  If unusre, say Y.
+	  If unsure, say Y.
 
 source "sound/oss/dmasound/Kconfig"