In the sources the 
returning d
2 is missing both before the last demisemiquaver and the next two notes at that pitch. Chopin's oversight is undeniable, yet if we were to evaluate the sound only, one can ponder whether the was supposed to be already before the last demisemiquaver or only before the dotted quaver in the middle of the bar. From the psychological point of view, the second possibility is much more likely: it is hard to assume that Chopin would have forgotten an accidental differentiating two adjacent notes in a chromatic passage.
Compare the passage in the sources »
category imprint: Interpretations within context; Editorial revisions
issues: Errors in FE, Errors in EE, Omissions to cancel alteration, Errors in GE, Errors of A
notation: Pitch