staging: rtl8712: add space before binary operator

Add a space before the binary operator "|" to comply with kernel coding
style.  Identified by checkpatch.

Signed-off-by: Deborah Brouwer <deborahbrouwer3563@gmail.com>
Link: https://lore.kernel.org/r/6db3ca92022376d162289174e201c79017b366db.1617674639.git.deborahbrouwer3563@gmail.com


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