staging: i4l: icn: donot assign in if statement

It is not the kernel coding style to make assignments in the if
statement and checkpatch was warning us about it.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>