dirstate: fix compilation warnings in `dirstate_item_set_possibly_dirty()` Since https://phab.mercurial-scm.org/D11387 (i.e. the same patch as mentioned in my previous patch), Clang has also started warning about `dirstate_item_set_possibly_dirty()` missing an explicit return, and about its use of the result of an assignment as a condition without using parentheses. This patch fixes that. Differential Revision: https://phab.mercurial-scm.org/D11445