Staging: iio: Do not use multiple blank lines

This patch removes unnecessary blank lines between functions.
Found by checkpatch.pl:
"CHECK: Please don't use multiple blank lines".

Signed-off-by: Cristina Opriceana <cristina.opriceana@gmail.com>
Reviewed-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>