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

Spell "unknown" correctly.

Signed-off-by: Jonathan Neuschäfer <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

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

···
 		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

···
 		sio_cc_pwd_mode = SIO_CC_PWD_MODE_LEVEL_OSC;
 		break;
 	default:
-		/* Unknow sleep mode */
+		/* Unknown sleep mode */
 		return -EINVAL;
 	}