No not return error from autofs_find_pipe_read_end, if pipe end wasn't found,
because read_fd remains negative.
There is another explicit check in the caller of this function for read_fd and
proper messages are printed in such a case.
Return -ENOENT in case of read end of the pipe doesn't exist to distinguish
with other error types (will be used later).
Signed-off-by: Stanislav Kinsburskiy <skinsbursky@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>