K 10
svn:author
V 6
jilles
K 8
svn:date
V 27
2018-09-05T19:16:09.479121Z
K 7
svn:log
V 232
sh: Fix formal overflow in pointer arithmetic

The intention is to lower the value of the pointer, which according to ubsan
cannot be done by adding an unsigned quantity.

Reported by:	kevans
Approved by:	re (kib)
MFC after:	1 week

END