[git commit master] ash: remake strange signed char machinery to be unsigned. -57 bytes

[Denys Vlasenko]

commit: http://git.busybox.net/busybox/commit/?id=cd71683ae6a98962f87a7ffb4f8cd3fc13e576dc
branch: http://git.busybox.net/busybox/commit/?id=refs/heads/master

Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>

Patch is too large, so refusing to show it