staging: vt6655: Fix the spacing around operators

Add space around operators to comply in that way with the preferred
coding style for the linux kernel. Issue found by checkpatch.

Suggested-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Frank A. Cancio Bello <frank@generalsoftwareinc.com>
Link: https://lore.kernel.org/r/0f77b97e88c28c503caf25fafb84729509969ec3.1572649242.git.frank@generalsoftwareinc.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>