Fix regarding ra_PreambleIndex in new RA attempts after fail

openair2/LAYER2/NR_MAC_UE/nr_ra_procedures.c

@@ -801,6 +801,7 @@ void nr_ra_failed(uint8_t mod_id, uint8_t CC_id, NR_PRACH_RESOURCES_t *prach_res
   RA_config_t *ra = &mac->ra;
 
   ra->first_Msg3 = 1;
+  ra->ra_PreambleIndex     = -1;
   ra->generate_nr_prach = RA_FAILED;
   ra->ra_state = RA_UE_IDLE;