Fix Coverity Scan CID 60393 (Using uninitialized value pid when calling esm_ebr_context_release.)

openair3/NAS/UE/ESM/EpsBearerContextDeactivation.c

@@ -196,6 +196,7 @@ int esm_proc_eps_bearer_context_deactivate_request(nas_user_t *user, int ebi, in
   int rc = RETURNok;
   esm_data_t *esm_data = user->esm_data;
   bid = 0;
+  pid = 0;
 
   LOG_TRACE(INFO, "ESM-PROC  - EPS bearer context deactivation "
             "requested by the network (ebi=%d)", ebi);