staging: r8188eu: remove some obsolete comments

Remove obsolete comments in validate_recv_data_frame.
There is no prxcmd variable (any more?).
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Link: https://lore.kernel.org/r/20221106124901.720785-3-martin@kaiser.cxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_recv.c

@@ -1065,8 +1065,6 @@ static int validate_recv_data_frame(struct adapter *adapter,
 	if (!psta)
 		return _FAIL;
 
-	/* psta->rssi = prxcmd->rssi; */
-	/* psta->signal_quality = prxcmd->sq; */
 	precv_frame->psta = psta;
 
 	pattrib->amsdu = 0;