r8192U_wx.c: style: Unnecessary parentheses

fix checkpatch.pl check:

CHECK: Unnecessary parentheses around expr
in drivers/staging/rtl8192u/r8192U_wx.c

Signed-off-by: Bruno Raoult <braoult@gmail.com>
Link: https://lore.kernel.org/r/f42993e183e1127dcc9fce3f0ed42dd6d795c647.1616748922.git.braoult@gmail.com


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