Fix Coverity Scan CID 341067 (Null-checking mac_MainConfig suggests that it...

Fix Coverity Scan CID 341067 (Null-checking mac_MainConfig suggests that it may be null, but it has already been dereferenced on all paths leading to the check.)

openair2/RRC/LTE/rrc_eNB.c

@@ -3928,18 +3928,16 @@ flexran_rrc_eNB_generate_defaultRRCConnectionReconfiguration(const protocol_ctxt
   free(quantityConfig);
   quantityConfig = NULL;
 
-  if(mac_MainConfig){
-      if(mac_MainConfig->ul_SCH_Config){
-          free(mac_MainConfig->ul_SCH_Config);
-          mac_MainConfig->ul_SCH_Config = NULL;
-      }
-      if(mac_MainConfig->phr_Config){
-          free(mac_MainConfig->phr_Config);
-          mac_MainConfig->phr_Config = NULL;
-      }
-      free(mac_MainConfig);
-      mac_MainConfig = NULL;
+  if(mac_MainConfig->ul_SCH_Config){
+    free(mac_MainConfig->ul_SCH_Config);
+    mac_MainConfig->ul_SCH_Config = NULL;
+  }
+  if(mac_MainConfig->phr_Config){
+    free(mac_MainConfig->phr_Config);
+    mac_MainConfig->phr_Config = NULL;
   }
+  free(mac_MainConfig);
+  mac_MainConfig = NULL;
 }