generic/001: remove unnecessary backslash

generic/001: remove unnecessary backslash

Awk 5.0.1 is complaining about this backslash and causing false alarm
like this:
    warning: regexp escape sequence '\#' is not a known regexp operator

This fix works fine with Awk 3.1.7 , 4.0.2 , 4.2.1 and 5.0.1. This
backslash is not necessary.

Signed-off-by: Murphy Zhou <jencce.kernel@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>