staging: iio: cdc: Don't put an else right after a return

This fixes the following checkpatch.pl warning:
WARNING: else is not generally useful after a break or return.

While at it, remove new line for symmetry with the rest of the code.

Signed-off-by: Catalina Mocanu <catalina.mocanu@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>