staging: ccree: remove assignement in conditional

Patch to fix following checkpatch error:
ERROR: do not use assignment in if condition

Signed-off-by: Tyler Olivieri <sleepingzucchini@gmail.com>
Acked-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>