staging: rtl8188eu: fix possible NULL dereference

dm_odm was being checked for NULL after dereferencing it. Lets check for
NULL first before derefenrencing it.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/hal/Hal8188ERateAdaptive.c

@@ -659,11 +659,11 @@ void ODM_RA_UpdateRateInfo_8188E(struct odm_dm_struct *dm_odm, u8 macid, u8 Rate
 {
 	struct odm_ra_info *pRaInfo = NULL;
 
+	if ((NULL == dm_odm) || (macid >= ASSOCIATE_ENTRY_NUM))
+		return;
 	ODM_RT_TRACE(dm_odm, ODM_COMP_RATE_ADAPTIVE, ODM_DBG_LOUD,
 		     ("macid =%d RateID = 0x%x RateMask = 0x%x SGIEnable =%d\n",
 		     macid, RateID, RateMask, SGIEnable));
-	if ((NULL == dm_odm) || (macid >= ASSOCIATE_ENTRY_NUM))
-		return;
 
 	pRaInfo = &(dm_odm->RAInfo[macid]);
 	pRaInfo->RateID = RateID;
@@ -676,10 +676,10 @@ void ODM_RA_SetRSSI_8188E(struct odm_dm_struct *dm_odm, u8 macid, u8 Rssi)
 {
 	struct odm_ra_info *pRaInfo = NULL;
 
-	ODM_RT_TRACE(dm_odm, ODM_COMP_RATE_ADAPTIVE, ODM_DBG_TRACE,
-		     (" macid =%d Rssi =%d\n", macid, Rssi));
 	if ((NULL == dm_odm) || (macid >= ASSOCIATE_ENTRY_NUM))
 		return;
+	ODM_RT_TRACE(dm_odm, ODM_COMP_RATE_ADAPTIVE, ODM_DBG_TRACE,
+		     (" macid =%d Rssi =%d\n", macid, Rssi));
 
 	pRaInfo = &(dm_odm->RAInfo[macid]);
 	pRaInfo->RssiStaRA = Rssi;