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>
SVN-Revision: 39583
b1d7ebae09