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

@@ -3928,7 +3928,6 @@ 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;
@@ -3939,7 +3938,6 @@ flexran_rrc_eNB_generate_defaultRRCConnectionReconfiguration(const protocol_ctxt
   }
   free(mac_MainConfig);
   mac_MainConfig = NULL;
-  }
 }