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iwconfig doesn't return values for "Link Quality" if the interface is disconnected, causing a division by zero error. If there are odd values, the resulting percentage may contain many decimal places. This patch makes wifi_get_link_quality return zero instead of failing and rounds the percentage to a more meaningful integer. Signed-off-by: Leo-Andres Hofmann <hofmann@leo-andres.de> Reviewed-by: Michael Tremer <michael.tremer@ipfire.org> Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>