The previous code was not exception safe and would eventually cause a
file to be destroyed without being closed, causing an assert failure.
Unfortunately it doesn't seem to be possible to test this without
error injection, since using an invalid directory fails before this
code is executed.
Fixes#4948
Signed-off-by: Rafael Ávila de Espíndola <espindola@scylladb.com>
Message-Id: <20190904002314.79591-1-espindola@scylladb.com>
(cherry picked from commit 000514e7cc)
1d94aac551