decode_SIB1: Was reading past the end of plmn_data

Found by -fsanitize=address

openair2/RRC/LTE/rrc_UE.c

@@ -2899,16 +2899,18 @@ int decode_SIB1( const protocol_ctxt_t *const ctxt_pP, const uint8_t eNB_index,
     }
 
     LOG_I( RRC, "PLMN %d MCC %0*d, MNC %0*d\n", i + 1, mccdigits, mcc, mncdigits, mnc);
-    // search internal table for provider name
-    int plmn_ind = 0;
 
-    while (plmn_data[plmn_ind].mcc > 0) {
+    // search internal table for provider name
+    const size_t num_plmn_data = sizeof(plmn_data) / sizeof(plmn_data[0]);
+    for (size_t plmn_ind = 0;; ++plmn_ind) {
+      if (plmn_ind == num_plmn_data) {
+        LOG_E( RRC, "Did not find name from internal table for %u %u\n", mcc, mnc);
+        break;
+      }
       if ((plmn_data[plmn_ind].mcc == mcc) && (plmn_data[plmn_ind].mnc == mnc)) {
         LOG_I( RRC, "Found %s (name from internal table)\n", plmn_data[plmn_ind].oper_short );
         break;
       }
-
-      plmn_ind++;
     }
   }
   LOG_I( RRC, "TAC 0x%04x\n",