more fixes on gcc warnings, misleading indentation and CPU mitigation when the traffic demand in 5G exeeds the available througput

openair2/LAYER2/nr_rlc/nr_rlc_entity_am.c

@@ -1529,7 +1529,7 @@ static int tx_list_size(nr_rlc_entity_am_t *entity,
 {
   int ret = 0;
 
-  while (l != NULL) {
+  while (l != NULL && ret < maxsize) {
     ret += compute_pdu_header_size(entity, l) + l->size;
     l = l->next;
   }

openair2/LAYER2/nr_rlc/nr_rlc_entity_tm.c

@@ -78,7 +78,7 @@ static int tx_list_size(nr_rlc_entity_tm_t *entity,
 {
   int ret = 0;
 
-  while (l != NULL) {
+  while (l != NULL && ret < maxsize) {
     ret += l->size;
     l = l->next;
   }

openair2/LAYER2/nr_rlc/nr_rlc_entity_um.c

@@ -497,7 +497,7 @@ static int tx_list_size(nr_rlc_entity_um_t *entity,
 {
   int ret = 0;
 
-  while (l != NULL) {
+  while (l != NULL && ret < maxsize) {
     ret += compute_pdu_header_size(entity, l) + l->size;
     l = l->next;
   }