Fix ULSCH ID type to handle large max_nb_pusch values (ULSCH procedures)

The ULSCH_id variable is currently defined as uint8_t, which limits its
range to 0-255. However, gNB->max_nb_pusch can exceed this range
depending on the configuration (buffer_ul_slots and MAX_MOBILES_PER_GNB).
This can lead to incorrect behavior or undefined results when max_nb_pusch
is larger than 255. This commit changes the type of ULSCH_id from uint8_t
to int to accommodate larger values of max_nb_pusch.

The issue was observed when running the OAI gNB with MAX_MOBILES_PER_GNB set
to 64 UEs. The root cause was traced back to the changes to UL processing
introduced in !3166 (!2952).

openair1/SCHED_NR/phy_procedures_nr_gNB.c

@@ -316,7 +316,7 @@ static int nr_ulsch_procedures(PHY_VARS_gNB *gNB, int frame_rx, int slot_rx, boo
   NR_DL_FRAME_PARMS *frame_parms = &gNB->frame_parms;
 
   int nb_pusch = 0;
-  for (uint8_t ULSCH_id = 0; ULSCH_id < gNB->max_nb_pusch; ULSCH_id++) {
+  for (int ULSCH_id = 0; ULSCH_id < gNB->max_nb_pusch; ULSCH_id++) {
     if (ulsch_to_decode[ULSCH_id]) {
       nb_pusch++;
     }
@@ -329,7 +329,7 @@ static int nr_ulsch_procedures(PHY_VARS_gNB *gNB, int frame_rx, int slot_rx, boo
   uint8_t ULSCH_ids[nb_pusch];
   uint32_t G[nb_pusch];
   int pusch_id = 0;
-  for (uint8_t ULSCH_id = 0; ULSCH_id < gNB->max_nb_pusch; ULSCH_id++) {
+  for (int ULSCH_id = 0; ULSCH_id < gNB->max_nb_pusch; ULSCH_id++) {
 
     if (ulsch_to_decode[ULSCH_id]) {