staging: rtl8192u: fixed no space coding style issue.

Added space around the binary operator for readability in
r8192U_wx.c file

Signed-off-by: zhaoxiao <zhaoxiao@uniontech.com>
Link: https://lore.kernel.org/r/20210315061202.10219-1-zhaoxiao@uniontech.com


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