staging: iio: resolver: add spaces around operators

Add spaces around operators to improve readability and to address the
checkpatch issue:

CHECK: spaces preferred around that '/' (ctx:VxV)

Signed-off-by: Eva Rachel Retuya <eraretuya@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>