Staging: rtl8192e: Remove unnecessary parentheses

Staging: rtl8192e: Remove unnecessary parentheses

This addresses an issue raised by checkpatch.pl:

     $ ./scripts/checkpatch.pl --terse -f drivers/staging/rtl8192e/rtllib_wx.c
     Unnecessary parentheses around wrqu->encoding

Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Signed-off-by: Felix Schlepper <f3sch.git@outlook.com>
Link: https://lore.kernel.org/r/0e4e340be3f4c7f35a5381b726b1db5fc6842f10.1656667089.git.f3sch.git@outlook.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>