use for loop instead of while

Co-authored-by: Jan Macku <[email protected]>

network-scripts/ifup-eth

@@ -302,7 +302,7 @@ else
                             exit 1
                         fi
                     done
-                    if [ "${tries}" -gt "${ARPING_TRIES}" ]; then
+                    if [ "${tries}" -eq "${ARPING_TRIES}" ]; then
                         net_log $"arping failed after $tries tries"
                         exit 1
                     fi