[PATCH] D41319: libcxx: Fix for basic_stringbuf::seekoff() after r320604.

[Marshall Clow via Phabricator via cfe-commits]

mclow.lists accepted this revision.
mclow.lists added a comment.
This revision is now accepted and ready to land.

LGTM. I'm going to sprinkle `const` throughout this file later, but that is a drive-by thing. 
All the lines that start out `ptrdiff_t __hm = ` will soon be `const ptrdiff_t __hm = `, 
but that's not necessary for this bug fix.


https://reviews.llvm.org/D41319