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The mtdpartsize macro triggers shell errors on various Linux distributions when the partname argument $(1) does not appear within the partmap $(2). Change the sed pattern to only emit anything if a successful substitution occured and only evaluate the arithmetic expression if something was printed by the sed program. Signed-off-by: Jo-Philipp Wich <jow@openwrt.org> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39583 3c298f89-4303-0410-b956-a3cf2f4a3e73