Fist use extended regexp in order to drop the '\' around the
parentheses which is not supported by BSD sed in regular mode.
Secondly use [[:blank:]] instead of \s, as the later is a GNU
extension.
No functional change intended.
Signed-off-by: Roger Pau Monné <royger@FreeBSD.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
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