backup-buffer now reports .emacs.d/%backup% ills

backup-buffer now reports .emacs.d/%backup% ills

* lisp/files.el (backup-buffer): If the write to .emacs.d/%backup%
fails due to disk space exhaustion or whatever, do not pretend
that it succeeded.  More generally, do a better job of checking
for I/O failures, and limit the scope of the condition-case to
just the operations where file errors should be caught and ignored
(Bug#20595).  Also, don't bother trying to delete later backups if
an earlier deletion fails, as this is a sign of trouble and it's
better to stop when there's trouble.