media: rtl28xxu: replace a NO-BREAK SPACE character

Instead of using:

	- U+00a0 (' '): NO-BREAK SPACE

Use a normal white space.

This was probably introduced by some cut-and-paste.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/usb/dvb-usb-v2/rtl28xxu.c

@@ -1777,7 +1777,7 @@ static int rtl2832u_rc_query(struct dvb_usb_device *d)
 		ir_raw_event_store_with_filter(d->rc_dev, &ev);
 	}
 
-	/* 'flush' ir_raw_event_store_with_filter() */
+	/* 'flush' ir_raw_event_store_with_filter() */
 	ir_raw_event_handle(d->rc_dev);
 exit:
 	return ret;