media: dvb-frontends: Fix a typo ("Unknow sleep mode")

Spell "unknown" correctly.
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/dvb-frontends/drx39xyj/drxj.c

@@ -11070,7 +11070,7 @@ ctrl_power_mode(struct drx_demod_instance *demod, enum drx_power_mode *mode)
 		sio_cc_pwd_mode = SIO_CC_PWD_MODE_LEVEL_OSC;
 		break;
 	default:
-		/* Unknow sleep mode */
+		/* Unknown sleep mode */
 		return -EINVAL;
 	}
 

drivers/media/dvb-frontends/drxk_hard.c

@@ -1585,7 +1585,7 @@ static int ctrl_power_mode(struct drxk_state *state, enum drx_power_mode *mode)
 		sio_cc_pwd_mode = SIO_CC_PWD_MODE_LEVEL_OSC;
 		break;
 	default:
-		/* Unknow sleep mode */
+		/* Unknown sleep mode */
 		return -EINVAL;
 	}