Remove unreachable statements

As seen with clang -Wunreachable-code

utils/jewel.c

@@ -97,7 +97,6 @@ nfc_initiator_jewel_cmd(nfc_device *pnd, const jewel_req req, jewel_res *pres)
       break;
     default:
       return false;
-      break;
   }
 
   if (nfc_initiator_transceive_bytes(pnd, (uint8_t *)&req, nLenReq, (uint8_t *)pres, nLenRes, -1) < 0) {

utils/mifare.c

@@ -95,7 +95,6 @@ nfc_initiator_mifare_cmd(nfc_device *pnd, const mifare_cmd mc, const uint8_t ui8
       // Please fix your code, you never should reach this statement
     default:
       return false;
-      break;
   }
 
   // When available, copy the parameter bytes

utils/nfc-read-forum-tag3.c

@@ -178,7 +178,6 @@ main(int argc, char *argv[])
       case 'h':
         print_usage(argv[0]);
         exit(EXIT_SUCCESS);
-        break;
       case 'q':
         quiet = true;
         break;