staging: r8188eu: remove useless check

smatch says:
usb_intf.c:326 rtw_hw_suspend() warn: variable dereferenced before check 'padapter' (see line 323)
usb_intf.c:387 rtw_hw_resume() warn: variable dereferenced before check 'padapter' (see line 385)

There is only one caller of rtw_hw_suspend() and it does not check
padapter pointer, so let's just omit this check to make smatch happy.
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Link: https://lore.kernel.org/r/20210905204218.19317-1-paskripkin@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/os_dep/usb_intf.c

@@ -323,9 +323,6 @@ int rtw_hw_suspend(struct adapter *padapter)
 	struct pwrctrl_priv *pwrpriv = &padapter->pwrctrlpriv;
 	struct net_device *pnetdev = padapter->pnetdev;
 
-
-	if (!padapter)
-		goto error_exit;
 	if ((!padapter->bup) || (padapter->bDriverStopped) ||
 	    (padapter->bSurpriseRemoved)) {
 		DBG_88E("padapter->bup=%d bDriverStopped=%d bSurpriseRemoved = %d\n",